MediaStream content_unittests need to trigger a GC before tear down

content/renderer/media/webrtc/media_stream_remote_video_source_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 "base/message_loop/message_loop.h"
 #include "base/run_loop.h"
 #include "base/strings/utf_string_conversions.h"
 #include "content/child/child_process.h"
 #include "content/renderer/media/media_stream_video_track.h"
 #include "content/renderer/media/mock_media_stream_video_sink.h"
 #include "content/renderer/media/webrtc/media_stream_remote_video_source.h"
 #include "content/renderer/media/webrtc/mock_peer_connection_dependency_factory.h"
 #include "media/base/video_frame.h"
 #include "testing/gtest/include/gtest/gtest.h"
+#include "third_party/WebKit/public/web/WebHeap.h"
 #include "third_party/libjingle/source/talk/media/webrtc/webrtcvideoframe.h"
 
 namespace content {
 
 ACTION_P(RunClosure, closure) {
   closure.Run();
 }
 
 class MediaStreamRemoteVideoSourceUnderTest
     : public MediaStreamRemoteVideoSource {
@@ skipping 16 matching lines @@
         remote_source_(new MediaStreamRemoteVideoSourceUnderTest(
             webrtc_video_track_.get())),
         number_of_successful_constraints_applied_(0),
         number_of_failed_constraints_applied_(0) {
     webkit_source_.initialize(base::UTF8ToUTF16("dummy_source_id"),
                               blink::WebMediaStreamSource::TypeVideo,
                               base::UTF8ToUTF16("dummy_source_name"));
     webkit_source_.setExtraData(remote_source_);
   }
 
+  virtual void TearDown() OVERRIDE {
+    webkit_source_.reset();
+    blink::WebHeap::collectAllGarbageForTesting();
+  }
+
   MediaStreamRemoteVideoSourceUnderTest* source() {
     return remote_source_;
   }
 
- MediaStreamVideoTrack* CreateTrack() {
-   bool enabled = true;
-   blink::WebMediaConstraints constraints;
-   constraints.initialize();
-   return new MediaStreamVideoTrack(
-       source(),
-       constraints,
-       base::Bind(
-           &MediaStreamRemoteVideoSourceTest::OnConstraintsApplied,
-           base::Unretained(this)),
-       enabled);
+  MediaStreamVideoTrack* CreateTrack() {
+    bool enabled = true;
+    blink::WebMediaConstraints constraints;
+    constraints.initialize();
+    return new MediaStreamVideoTrack(
+        source(),
+        constraints,
+        base::Bind(
+            &MediaStreamRemoteVideoSourceTest::OnConstraintsApplied,
+            base::Unretained(this)),
+        enabled);
   }
 
   int NumberOfSuccessConstraintsCallbacks() const {
     return number_of_successful_constraints_applied_;
   }
 
   int NumberOfFailedConstraintsCallbacks() const {
     return number_of_failed_constraints_applied_;
   }
 
@@ skipping 57 matching lines @@
             webkit_source().readyState());
   StopWebRtcTrack();
   EXPECT_EQ(blink::WebMediaStreamSource::ReadyStateEnded,
             webkit_source().readyState());
   EXPECT_EQ(blink::WebMediaStreamSource::ReadyStateEnded, sink.state());
 
   track->RemoveSink(&sink);
 }
 
 }  // namespace content