Another big out-of-lining of test code. Hits a lot of gmock objects

media/video/video_mock_objects.h

Index: media/video/video_mock_objects.h
diff --git a/media/video/mock_objects.h b/media/video/video_mock_objects.h
similarity index 92%
rename from media/video/mock_objects.h
rename to media/video/video_mock_objects.h
index c0f3dd928596172f34200764c1943c81669a01a9..1a9592c3a673810591af59c681f7c634a08aaabb 100644
--- a/media/video/mock_objects.h
+++ b/media/video/video_mock_objects.h
@@ -13,8 +13,8 @@ namespace media {
 
 class MockVideoDecodeEngine : public VideoDecodeEngine {
  public:
-  MockVideoDecodeEngine() {}
-  virtual ~MockVideoDecodeEngine() {}
+  MockVideoDecodeEngine();
+  virtual ~MockVideoDecodeEngine();
 
   MOCK_METHOD4(Initialize, void(MessageLoop* message_loop,
                                 EventHandler* event_handler,
@@ -32,8 +32,8 @@ class MockVideoDecodeEngine : public VideoDecodeEngine {
 
 class MockVideoDecodeContext : public VideoDecodeContext {
  public:
-  MockVideoDecodeContext() {}
-  virtual ~MockVideoDecodeContext() {}
+  MockVideoDecodeContext();
+  virtual ~MockVideoDecodeContext();
 
   MOCK_METHOD0(GetDevice, void*());
   MOCK_METHOD6(AllocateVideoFrames, void(