MediaStream content_unittests need to trigger a GC before tear down

content/renderer/media/video_source_handler_unittest.cc

Index: content/renderer/media/video_source_handler_unittest.cc
diff --git a/content/renderer/media/video_source_handler_unittest.cc b/content/renderer/media/video_source_handler_unittest.cc
index 94dce46a19511a5504654eca553ce5fe10124ef8..1a5cb78326d84f2d701292ab1456b78b1f186641 100644
--- a/content/renderer/media/video_source_handler_unittest.cc
+++ b/content/renderer/media/video_source_handler_unittest.cc
@@ -17,6 +17,7 @@
 #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"
 
 namespace content {
 
@@ -44,17 +45,22 @@ class VideoSourceHandlerTest : public ::testing::Test {
  public:
   VideoSourceHandlerTest()
        : child_process_(new ChildProcess()),
-         registry_() {
-    handler_.reset(new VideoSourceHandler(&registry_));
-    registry_.Init(kTestStreamUrl);
-    registry_.AddVideoTrack(kTestVideoTrackId);
+         registry_(new MockMediaStreamRegistry()) {
+    handler_.reset(new VideoSourceHandler(registry_.get()));
+    registry_->Init(kTestStreamUrl);
+    registry_->AddVideoTrack(kTestVideoTrackId);
+  }
+
+  virtual void TearDown() {
+    registry_.reset();
+    blink::WebHeap::collectAllGarbageForTesting();
   }
 
  protected:
   base::MessageLoop message_loop_;
   scoped_ptr<ChildProcess> child_process_;
   scoped_ptr<VideoSourceHandler> handler_;
-  MockMediaStreamRegistry registry_;
+  scoped_ptr<MockMediaStreamRegistry> registry_;
 };
 
 TEST_F(VideoSourceHandlerTest, OpenClose) {