Replace rtc::Optional with absl::optional

This is a no-op change because rtc::Optional is an alias to absl::optional

This CL generated by running script passing top level directories except rtc_base and api

find $@ -type f \( -name \*.h -o -name \*.cc -o -name \*.mm \) \
-exec sed -i 's|rtc::Optional|absl::optional|g' {} \+ \
-exec sed -i 's|rtc::nullopt|absl::nullopt|g' {} \+ \
-exec sed -i 's|#include "api/optional.h"|#include "absl/types/optional.h"|' {} \+

find $@ -type f -name BUILD.gn \
-exec sed -r -i 's|"[\./api]*:optional"|"//third_party/abseil-cpp/absl/types:optional"|' {} \+;

git cl format

Bug: webrtc:9078
Change-Id: I9465c172e65ba6e6ed4e4fdc35b0b265038d6f71
Reviewed-on: https://webrtc-review.googlesource.com/84584
Reviewed-by: Karl Wiberg <kwiberg@webrtc.org>
Commit-Queue: Danil Chapovalov <danilchap@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#23697}

common_audio/BUILD.gn

@@ -64,7 +64,6 @@ rtc_static_library("common_audio") {
     ":sinc_resampler",
     "..:webrtc_common",
     "../:typedefs",
-    "../api:optional",
     "../rtc_base:checks",
     "../rtc_base:gtest_prod",
     "../rtc_base:rtc_base_approved",
@@ -72,6 +71,7 @@ rtc_static_library("common_audio") {
     "../rtc_base/memory:aligned_malloc",
     "../system_wrappers",
     "../system_wrappers:cpu_features_api",
+    "//third_party/abseil-cpp/absl/types:optional",
   ]
 
   defines = []

common_audio/mocks/mock_smoothing_filter.h

@@ -19,7 +19,7 @@ namespace webrtc {
 class MockSmoothingFilter : public SmoothingFilter {
  public:
   MOCK_METHOD1(AddSample, void(float));
-  MOCK_METHOD0(GetAverage, rtc::Optional<float>());
+  MOCK_METHOD0(GetAverage, absl::optional<float>());
   MOCK_METHOD1(SetTimeConstantMs, bool(int));
 };
 

common_audio/smoothing_filter.cc

@@ -52,10 +52,10 @@ void SmoothingFilterImpl::AddSample(float sample) {
   last_sample_ = sample;
 }
 
-rtc::Optional<float> SmoothingFilterImpl::GetAverage() {
+absl::optional<float> SmoothingFilterImpl::GetAverage() {
   if (!init_end_time_ms_) {
     // |init_end_time_ms_| undefined since we have not received any sample.
-    return rtc::nullopt;
+    return absl::nullopt;
   }
   ExtrapolateLastSample(rtc::TimeMillis());
   return state_;

common_audio/smoothing_filter.h

@@ -11,7 +11,7 @@
 #ifndef COMMON_AUDIO_SMOOTHING_FILTER_H_
 #define COMMON_AUDIO_SMOOTHING_FILTER_H_
 
-#include "api/optional.h"
+#include "absl/types/optional.h"
 #include "rtc_base/constructormagic.h"
 #include "system_wrappers/include/clock.h"
 
@@ -21,7 +21,7 @@ class SmoothingFilter {
  public:
   virtual ~SmoothingFilter() = default;
   virtual void AddSample(float sample) = 0;
-  virtual rtc::Optional<float> GetAverage() = 0;
+  virtual absl::optional<float> GetAverage() = 0;
   virtual bool SetTimeConstantMs(int time_constant_ms) = 0;
 };
 
@@ -44,7 +44,7 @@ class SmoothingFilterImpl final : public SmoothingFilter {
   ~SmoothingFilterImpl() override;
 
   void AddSample(float sample) override;
-  rtc::Optional<float> GetAverage() override;
+  absl::optional<float> GetAverage() override;
   bool SetTimeConstantMs(int time_constant_ms) override;
 
   // Methods used for unittests.
@@ -58,7 +58,7 @@ class SmoothingFilterImpl final : public SmoothingFilter {
   const float init_factor_;
   const float init_const_;
 
-  rtc::Optional<int64_t> init_end_time_ms_;
+  absl::optional<int64_t> init_end_time_ms_;
   float last_sample_;
   float alpha_;
   float state_;