Convert MediaLog from being ref counted to owned by WebMediaPlayer.

media/formats/mp4/aac_unittest.cc

Index: media/formats/mp4/aac_unittest.cc
diff --git a/media/formats/mp4/aac_unittest.cc b/media/formats/mp4/aac_unittest.cc
index 645dbe800500eae246924cf0d18510e5b92dd52b..dcf1e426695d41360a2cec83257ea9989a027a1d 100644
--- a/media/formats/mp4/aac_unittest.cc
+++ b/media/formats/mp4/aac_unittest.cc
@@ -49,13 +49,13 @@ MATCHER_P(UnsupportedAudioProfileLog, profile_string, "") {
 
 class AACTest : public testing::Test {
  public:
-  AACTest() : media_log_(new StrictMock<MockMediaLog>()) {}
+  AACTest() {}
 
   bool Parse(const std::vector<uint8_t>& data) {
-    return aac_.Parse(data, media_log_);
+    return aac_.Parse(data, &media_log_);
   }
 
-  scoped_refptr<StrictMock<MockMediaLog>> media_log_;
+  StrictMock<MockMediaLog> media_log_;
   AAC aac_;
 };