Convert MediaLog from being ref counted to owned by WebMediaPlayer.

media/formats/webm/webm_content_encodings_client_unittest.cc

Index: media/formats/webm/webm_content_encodings_client_unittest.cc
diff --git a/media/formats/webm/webm_content_encodings_client_unittest.cc b/media/formats/webm/webm_content_encodings_client_unittest.cc
index 268eee016285e78bccb6b422f2d61c11796a5f2c..9dcc12c63321c8d458c0bac6a53d80293a6fca61 100644
--- a/media/formats/webm/webm_content_encodings_client_unittest.cc
+++ b/media/formats/webm/webm_content_encodings_client_unittest.cc
@@ -51,9 +51,7 @@ MATCHER_P(UnexpectedContentEncAlgo, algo, "") {
 class WebMContentEncodingsClientTest : public testing::Test {
  public:
   WebMContentEncodingsClientTest()
-      : media_log_(new StrictMock<MockMediaLog>()),
-        client_(media_log_),
-        parser_(kWebMIdContentEncodings, &client_) {}
+      : client_(&media_log_), parser_(kWebMIdContentEncodings, &client_) {}
 
   void ParseAndExpectToFail(const uint8_t* buf, int size) {
     int result = parser_.Parse(buf, size);
@@ -61,7 +59,7 @@ class WebMContentEncodingsClientTest : public testing::Test {
   }
 
  protected:
-  scoped_refptr<StrictMock<MockMediaLog>> media_log_;
+  StrictMock<MockMediaLog> media_log_;
   WebMContentEncodingsClient client_;
   WebMListParser parser_;
 };