Replace std::string::find() == 0 with absl::StartsWith.

Bug: None
Change-Id: I070c4a5d19455f3a5c5d3ccc05f418545c351987
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/172584
Reviewed-by: Karl Wiberg <kwiberg@webrtc.org>
Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#30960}

modules/congestion_controller/goog_cc/BUILD.gn

@@ -51,6 +51,7 @@ rtc_library("goog_cc") {
     "../../../rtc_base/experiments:rate_control_settings",
     "../../../system_wrappers",
     "../../remote_bitrate_estimator",
+    "//third_party/abseil-cpp/absl/strings",
     "//third_party/abseil-cpp/absl/types:optional",
   ]
 }
@@ -78,6 +79,7 @@ rtc_library("pushback_controller") {
     "../../../api/units:data_size",
     "../../../rtc_base:checks",
     "../../../rtc_base/experiments:rate_control_settings",
+    "//third_party/abseil-cpp/absl/strings",
     "//third_party/abseil-cpp/absl/types:optional",
   ]
 }
@@ -137,6 +139,7 @@ rtc_library("estimators") {
     "../../../rtc_base:safe_minmax",
     "../../../rtc_base/experiments:field_trial_parser",
     "../../remote_bitrate_estimator",
+    "//third_party/abseil-cpp/absl/strings",
     "//third_party/abseil-cpp/absl/types:optional",
   ]
 }
@@ -162,6 +165,7 @@ rtc_library("loss_based_controller") {
     "../../../system_wrappers:field_trial",
     "../../../system_wrappers:metrics",
     "../../remote_bitrate_estimator",
+    "//third_party/abseil-cpp/absl/strings",
     "//third_party/abseil-cpp/absl/types:optional",
   ]
 }
@@ -187,6 +191,7 @@ rtc_library("delay_based_bwe") {
     "../../../system_wrappers:metrics",
     "../../pacing",
     "../../remote_bitrate_estimator",
+    "//third_party/abseil-cpp/absl/strings",
     "//third_party/abseil-cpp/absl/types:optional",
   ]
 }
@@ -213,6 +218,7 @@ rtc_library("probe_controller") {
     "../../../rtc_base/experiments:field_trial_parser",
     "../../../rtc_base/system:unused",
     "../../../system_wrappers:metrics",
+    "//third_party/abseil-cpp/absl/strings",
     "//third_party/abseil-cpp/absl/types:optional",
   ]
 }

modules/congestion_controller/goog_cc/congestion_window_pushback_controller.cc

@@ -16,6 +16,7 @@
 #include <algorithm>
 #include <string>
 
+#include "absl/strings/match.h"
 #include "rtc_base/checks.h"
 #include "rtc_base/experiments/rate_control_settings.h"
 
@@ -24,8 +25,9 @@ namespace webrtc {
 CongestionWindowPushbackController::CongestionWindowPushbackController(
     const WebRtcKeyValueConfig* key_value_config)
     : add_pacing_(
-          key_value_config->Lookup("WebRTC-AddPacingToCongestionWindowPushback")
-              .find("Enabled") == 0),
+          absl::StartsWith(key_value_config->Lookup(
+                               "WebRTC-AddPacingToCongestionWindowPushback"),
+                           "Enabled")),
       min_pushback_target_bitrate_bps_(
           RateControlSettings::ParseFromKeyValueConfig(key_value_config)
               .CongestionWindowMinPushbackTargetBitrateBps()),

modules/congestion_controller/goog_cc/delay_based_bwe.cc

@@ -17,6 +17,7 @@
 #include <string>
 #include <utility>
 
+#include "absl/strings/match.h"
 #include "api/rtc_event_log/rtc_event.h"
 #include "api/rtc_event_log/rtc_event_log.h"
 #include "logging/rtc_event_log/events/rtc_event_bwe_update_delay_based.h"
@@ -113,9 +114,9 @@ DelayBasedBwe::DelayBasedBwe(const WebRtcKeyValueConfig* key_value_config,
       prev_bitrate_(DataRate::Zero()),
       has_once_detected_overuse_(false),
       prev_state_(BandwidthUsage::kBwNormal),
-      alr_limited_backoff_enabled_(
-          key_value_config->Lookup("WebRTC-Bwe-AlrLimitedBackoff")
-              .find("Enabled") == 0) {
+      alr_limited_backoff_enabled_(absl::StartsWith(
+          key_value_config->Lookup("WebRTC-Bwe-AlrLimitedBackoff"),
+          "Enabled")) {
   RTC_LOG(LS_INFO) << "Initialized DelayBasedBwe with small packet filtering "
                    << ignore_small_.Parser()->Encode()
                    << ", separate audio overuse detection"

modules/congestion_controller/goog_cc/goog_cc_network_control.cc

@@ -21,6 +21,7 @@
 #include <utility>
 #include <vector>
 
+#include "absl/strings/match.h"
 #include "api/units/time_delta.h"
 #include "logging/rtc_event_log/events/rtc_event_remote_estimate.h"
 #include "modules/congestion_controller/goog_cc/alr_detector.h"
@@ -53,11 +54,11 @@ int64_t GetBpsOrDefault(const absl::optional<DataRate>& rate,
 }
 
 bool IsEnabled(const WebRtcKeyValueConfig* config, absl::string_view key) {
-  return config->Lookup(key).find("Enabled") == 0;
+  return absl::StartsWith(config->Lookup(key), "Enabled");
 }
 
 bool IsNotDisabled(const WebRtcKeyValueConfig* config, absl::string_view key) {
-  return config->Lookup(key).find("Disabled") != 0;
+  return !absl::StartsWith(config->Lookup(key), "Disabled");
 }
 }  // namespace
 

modules/congestion_controller/goog_cc/probe_controller.cc

@@ -15,6 +15,7 @@
 #include <memory>
 #include <string>
 
+#include "absl/strings/match.h"
 #include "api/units/data_rate.h"
 #include "api/units/time_delta.h"
 #include "api/units/timestamp.h"
@@ -129,12 +130,12 @@ ProbeControllerConfig::~ProbeControllerConfig() = default;
 ProbeController::ProbeController(const WebRtcKeyValueConfig* key_value_config,
                                  RtcEventLog* event_log)
     : enable_periodic_alr_probing_(false),
-      in_rapid_recovery_experiment_(
-          key_value_config->Lookup(kBweRapidRecoveryExperiment)
-              .find("Enabled") == 0),
-      limit_probes_with_allocateable_rate_(
-          key_value_config->Lookup(kCappedProbingFieldTrialName)
-              .find("Disabled") != 0),
+      in_rapid_recovery_experiment_(absl::StartsWith(
+          key_value_config->Lookup(kBweRapidRecoveryExperiment),
+          "Enabled")),
+      limit_probes_with_allocateable_rate_(!absl::StartsWith(
+          key_value_config->Lookup(kCappedProbingFieldTrialName),
+          "Disabled")),
       event_log_(event_log),
       config_(ProbeControllerConfig(key_value_config)) {
   Reset(0);

modules/congestion_controller/goog_cc/send_side_bandwidth_estimation.cc

@@ -16,6 +16,7 @@
 #include <memory>
 #include <string>
 
+#include "absl/strings/match.h"
 #include "api/rtc_event_log/rtc_event.h"
 #include "api/rtc_event_log/rtc_event_log.h"
 #include "logging/rtc_event_log/events/rtc_event_bwe_update_loss_based.h"
@@ -60,7 +61,7 @@ bool BweLossExperimentIsEnabled() {
   std::string experiment_string =
       webrtc::field_trial::FindFullName(kBweLosExperiment);
   // The experiment is enabled iff the field trial string begins with "Enabled".
-  return experiment_string.find("Enabled") == 0;
+  return absl::StartsWith(experiment_string, "Enabled");
 }
 
 bool ReadBweLossExperimentParameters(float* low_loss_threshold,

modules/congestion_controller/goog_cc/trendline_estimator.cc

@@ -15,6 +15,7 @@
 #include <algorithm>
 #include <string>
 
+#include "absl/strings/match.h"
 #include "absl/types/optional.h"
 #include "modules/remote_bitrate_estimator/include/bwe_defines.h"
 #include "modules/remote_bitrate_estimator/test/bwe_test_logging.h"
@@ -115,8 +116,9 @@ constexpr char TrendlineEstimatorSettings::kKey[];
 
 TrendlineEstimatorSettings::TrendlineEstimatorSettings(
     const WebRtcKeyValueConfig* key_value_config) {
-  if (key_value_config->Lookup(kBweWindowSizeInPacketsExperiment)
-          .find("Enabled") == 0) {
+  if (absl::StartsWith(
+          key_value_config->Lookup(kBweWindowSizeInPacketsExperiment),
+          "Enabled")) {
     window_size = ReadTrendlineFilterWindowSize(key_value_config);
   }
   Parser()->Parse(key_value_config->Lookup(TrendlineEstimatorSettings::kKey));