Use ScopedTaskEnvironment instead of MessageLoopForUI in content tests.

content/renderer/media/webrtc/media_stream_track_metrics_unittest.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <stddef.h>
 
 #include "base/bind.h"
-#include "base/message_loop/message_loop.h"
 #include "base/run_loop.h"
+#include "base/test/scoped_task_environment.h"
 #include "base/threading/thread.h"
 #include "content/renderer/media/webrtc/media_stream_track_metrics.h"
 #include "content/renderer/media/webrtc/mock_peer_connection_dependency_factory.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "third_party/webrtc/api/mediastreaminterface.h"
 
 using webrtc::AudioSourceInterface;
 using webrtc::AudioTrackInterface;
 using webrtc::AudioTrackSinkInterface;
@@ skipping 58 matching lines @@
   virtual ~MockMediaStreamTrackMetrics() {}
 
   MOCK_METHOD4(SendLifetimeMessage,
                void(const std::string&, TrackType, LifetimeEvent, StreamType));
 
   using MediaStreamTrackMetrics::MakeUniqueIdImpl;
 };
 
 class MediaStreamTrackMetricsTest : public testing::Test {
  public:
-  MediaStreamTrackMetricsTest() : signaling_thread_("signaling_thread") {}
+  MediaStreamTrackMetricsTest()
+      : scoped_task_environment_(
+            base::test::ScopedTaskEnvironment::MainThreadType::UI),
+        signaling_thread_("signaling_thread") {}
+
   void SetUp() override {
     metrics_.reset(new MockMediaStreamTrackMetrics());
     stream_ = new rtc::RefCountedObject<MockMediaStream>("stream");
     signaling_thread_.Start();
   }
 
   void TearDown() override {
     signaling_thread_.Stop();
     metrics_.reset();
     stream_ = NULL;
@@ skipping 40 matching lines @@
     return new rtc::RefCountedObject<MockAudioTrackInterface>(id);
   }
 
   scoped_refptr<MockVideoTrackInterface> MakeVideoTrack(const std::string& id) {
     return new rtc::RefCountedObject<MockVideoTrackInterface>(id);
   }
 
   std::unique_ptr<MockMediaStreamTrackMetrics> metrics_;
   scoped_refptr<MediaStreamInterface> stream_;
 
-  base::MessageLoopForUI message_loop_;
+  base::test::ScopedTaskEnvironment scoped_task_environment_;
   base::Thread signaling_thread_;
 };
 
 TEST_F(MediaStreamTrackMetricsTest, MakeUniqueId) {
   // The important testable properties of the unique ID are that it
   // should differ when any of the three constituents differ
   // (PeerConnection pointer, track ID, remote or not. Also, testing
   // that the implementation does not discard the upper 32 bits of the
   // PeerConnection pointer is important.
   //
@@ skipping 424 matching lines @@
                                   MediaStreamTrackMetrics::SENT_STREAM));
   EXPECT_CALL(*metrics_,
               SendLifetimeMessage("video3",
                                   MediaStreamTrackMetrics::VIDEO_TRACK,
                                   MediaStreamTrackMetrics::DISCONNECTED,
                                   MediaStreamTrackMetrics::SENT_STREAM));
   metrics_->RemoveStream(MediaStreamTrackMetrics::SENT_STREAM, stream_.get());
 }
 
 }  // namespace content