Convert MediaLog from being ref counted to owned by WebMediaPlayer.

media/base/mock_media_log.h

Index: media/base/mock_media_log.h
diff --git a/media/base/mock_media_log.h b/media/base/mock_media_log.h
index c992fc22315b8a5be198c80e6ecbe861bffdbbb6..9e90fbe52a408a203692251c40d8ff80f6cb2db0 100644
--- a/media/base/mock_media_log.h
+++ b/media/base/mock_media_log.h
@@ -16,15 +16,16 @@
 // |outer| is the std::string searched for substring |sub|.
 #define CONTAINS_STRING(outer, sub) (std::string::npos != (outer).find(sub))
 
-// "media_log_" is expected to be a scoped_refptr<MockMediaLog>, optionally a
-// StrictMock, in scope of the usage of this macro.
-#define EXPECT_MEDIA_LOG(x) EXPECT_CALL(*media_log_, DoAddEventLogString((x)))
+// "media_log_" is expected to be a MockMediaLog, optionally a StrictMock, in
+// scope of the usage of this macro.
+#define EXPECT_MEDIA_LOG(x) EXPECT_CALL(media_log_, DoAddEventLogString((x)))
 
 namespace media {
 
 class MockMediaLog : public MediaLog {
  public:
   MockMediaLog();
+  ~MockMediaLog() override;
 
   MOCK_METHOD1(DoAddEventLogString, void(const std::string& event));
 
@@ -35,9 +36,6 @@ class MockMediaLog : public MediaLog {
     DoAddEventLogString(MediaEventToLogString(*event));
   }
 
- protected:
-  virtual ~MockMediaLog();
-
  private:
   DISALLOW_COPY_AND_ASSIGN(MockMediaLog);
 };