Use absl::make_unique and absl::WrapUnique directly

Instead of going through our wrappers in ptr_util.h.

This CL was generated by the following script:

  git grep -l ptr_util | xargs perl -pi -e 's,#include "rtc_base/ptr_util.h",#include "absl/memory/memory.h",'
  git grep -l MakeUnique | xargs perl -pi -e 's,\b(rtc::)?MakeUnique\b,absl::make_unique,g'
  git grep -l WrapUnique | xargs perl -pi -e 's,\b(rtc::)?WrapUnique\b,absl::WrapUnique,g'
  git checkout -- rtc_base/ptr_util{.h,_unittest.cc}
  git cl format

Followed by manually adding dependencies on
//third_party/abseil-cpp/absl/memory until `gn check` stopped
complaining.

Bug: webrtc:9473
Change-Id: I89ccd363f070479b8c431eb2c3d404a46eaacc1c
Reviewed-on: https://webrtc-review.googlesource.com/86600
Commit-Queue: Karl Wiberg <kwiberg@webrtc.org>
Reviewed-by: Danil Chapovalov <danilchap@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#23850}

rtc_tools/event_log_visualizer/analyzer.cc

@@ -17,6 +17,7 @@
 #include <string>
 #include <utility>
 
+#include "absl/memory/memory.h"
 #include "call/audio_receive_stream.h"
 #include "call/audio_send_stream.h"
 #include "call/call.h"
@@ -53,7 +54,6 @@
 #include "rtc_base/function_view.h"
 #include "rtc_base/logging.h"
 #include "rtc_base/numerics/sequence_number_util.h"
-#include "rtc_base/ptr_util.h"
 #include "rtc_base/rate_statistics.h"
 
 #ifndef BWE_TEST_LOGGING_COMPILE_TIME_ENABLE
@@ -1127,7 +1127,7 @@ void EventLogAnalyzer::CreateSendSideBweSimulationGraph(Plot* plot) {
   // we don't instantiate the AcknowledgedBitrateEstimator both here and in
   // SendSideCongestionController since that would lead to duplicate outputs.
   AcknowledgedBitrateEstimator acknowledged_bitrate_estimator(
-      rtc::MakeUnique<BitrateEstimator>());
+      absl::make_unique<BitrateEstimator>());
 #endif  // !(BWE_TEST_LOGGING_COMPILE_TIME_ENABLE)
   int64_t time_us = std::min(NextRtpTime(), NextRtcpTime());
   int64_t last_update_us = 0;