MediaStream content_unittests need to trigger a GC before tear down

content/renderer/media/webrtc/video_destination_handler_unittest.cc

 // Copyright (c) 2013 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 <string>
 
 #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.h"
 #include "content/renderer/media/media_stream_video_track.h"
 #include "content/renderer/media/mock_media_stream_registry.h"
 #include "content/renderer/media/mock_media_stream_video_sink.h"
 #include "content/renderer/media/webrtc/video_destination_handler.h"
 #include "content/renderer/pepper/pepper_plugin_instance_impl.h"
 #include "content/renderer/pepper/ppb_image_data_impl.h"
 #include "content/test/ppapi_unittest.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "third_party/WebKit/public/platform/WebMediaStreamTrack.h"
 #include "third_party/WebKit/public/platform/WebString.h"
+#include "third_party/WebKit/public/web/WebHeap.h"
 
 using ::testing::_;
 
 namespace content {
 
 ACTION_P(RunClosure, closure) {
   closure.Run();
 }
 
 static const std::string kTestStreamUrl = "stream_url";
 static const std::string kUnknownStreamUrl = "unknown_stream_url";
 
 class VideoDestinationHandlerTest : public PpapiUnittest {
  public:
   VideoDestinationHandlerTest()
      : child_process_(new ChildProcess()),
        registry_(new MockMediaStreamRegistry()) {
     registry_->Init(kTestStreamUrl);
   }
 
-  virtual void TearDown() {
+  virtual void TearDown() OVERRIDE {
     registry_.reset();
+    blink::WebHeap::collectAllGarbageForTesting();
     PpapiUnittest::TearDown();
   }
 
   base::MessageLoop* io_message_loop() const {
     return child_process_->io_message_loop();
   }
 
  protected:
   scoped_ptr<ChildProcess> child_process_;
   scoped_ptr<MockMediaStreamRegistry> registry_;
@@ skipping 45 matching lines @@
   // TODO(perkj): Verify that the track output I420 when
   // https://codereview.chromium.org/213423006/ is landed.
   EXPECT_EQ(1, sink.number_of_frames());
   native_track->RemoveSink(&sink);
 
   // The |frame_writer| is a proxy and is owned by whoever call Open.
   delete frame_writer;
 }
 
 }  // namespace content