Convert MediaLog from being ref counted to owned by WebMediaPlayer.

media/filters/decrypting_audio_decoder_unittest.cc

Index: media/filters/decrypting_audio_decoder_unittest.cc
diff --git a/media/filters/decrypting_audio_decoder_unittest.cc b/media/filters/decrypting_audio_decoder_unittest.cc
index 70166bf77f5ada41abae4b23f4d956d0101e6a57..fb34c765c5a7d004e8362c9030aad01211797101 100644
--- a/media/filters/decrypting_audio_decoder_unittest.cc
+++ b/media/filters/decrypting_audio_decoder_unittest.cc
@@ -57,7 +57,7 @@ class DecryptingAudioDecoderTest : public testing::Test {
   DecryptingAudioDecoderTest()
       : decoder_(new DecryptingAudioDecoder(
             message_loop_.task_runner(),
-            new MediaLog(),
+            &media_log_,
             base::Bind(&DecryptingAudioDecoderTest::OnWaitingForDecryptionKey,
                        base::Unretained(this)))),
         cdm_context_(new StrictMock<MockCdmContext>()),
@@ -246,6 +246,7 @@ class DecryptingAudioDecoderTest : public testing::Test {
   MOCK_METHOD0(OnWaitingForDecryptionKey, void(void));
 
   base::MessageLoop message_loop_;
+  MediaLog media_log_;
   std::unique_ptr<DecryptingAudioDecoder> decoder_;
   std::unique_ptr<StrictMock<MockCdmContext>> cdm_context_;
   std::unique_ptr<StrictMock<MockDecryptor>> decryptor_;