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}
diff --git a/pc/peerconnection_integrationtest.cc b/pc/peerconnection_integrationtest.cc
index 0bd9066..ed5db1f 100644
--- a/pc/peerconnection_integrationtest.cc
+++ b/pc/peerconnection_integrationtest.cc
@@ -885,7 +885,7 @@
       ASSERT_TRUE(fake_video_renderers_.find(video_track->id()) ==
                   fake_video_renderers_.end());
       fake_video_renderers_[video_track->id()] =
-          rtc::MakeUnique<FakeVideoTrackRenderer>(video_track);
+          absl::make_unique<FakeVideoTrackRenderer>(video_track);
     }
   }
   void OnRemoveTrack(
@@ -1165,7 +1165,7 @@
     modified_config.sdp_semantics = sdp_semantics_;
     if (!dependencies.cert_generator) {
       dependencies.cert_generator =
-          rtc::MakeUnique<FakeRTCCertificateGenerator>();
+          absl::make_unique<FakeRTCCertificateGenerator>();
     }
     std::unique_ptr<PeerConnectionWrapper> client(
         new PeerConnectionWrapper(debug_name));
@@ -1303,7 +1303,7 @@
         network_thread()->Invoke<std::unique_ptr<cricket::TestTurnServer>>(
             RTC_FROM_HERE,
             [thread, internal_address, external_address, type, common_name] {
-              return rtc::MakeUnique<cricket::TestTurnServer>(
+              return absl::make_unique<cricket::TestTurnServer>(
                   thread, internal_address, external_address, type,
                   /*ignore_bad_certs=*/true, common_name);
             });
@@ -1316,7 +1316,7 @@
     std::unique_ptr<cricket::TestTurnCustomizer> turn_customizer =
         network_thread()->Invoke<std::unique_ptr<cricket::TestTurnCustomizer>>(
             RTC_FROM_HERE,
-            [] { return rtc::MakeUnique<cricket::TestTurnCustomizer>(); });
+            [] { return absl::make_unique<cricket::TestTurnCustomizer>(); });
     turn_customizers_.push_back(std::move(turn_customizer));
     // Interactions with the turn customizer should be done on the network
     // thread.
@@ -4282,7 +4282,7 @@
   ASSERT_TRUE(CreatePeerConnectionWrappers());
   ConnectFakeSignaling();
 
-  auto output = rtc::MakeUnique<testing::NiceMock<MockRtcEventLogOutput>>();
+  auto output = absl::make_unique<testing::NiceMock<MockRtcEventLogOutput>>();
   ON_CALL(*output, IsActive()).WillByDefault(testing::Return(true));
   ON_CALL(*output, Write(::testing::_)).WillByDefault(testing::Return(true));
   EXPECT_CALL(*output, Write(::testing::_)).Times(::testing::AtLeast(1));