Convert MediaLog from being ref counted to owned by WebMediaPlayer.

media/filters/audio_timestamp_validator.h

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef MEDIA_FILTERS_AUDIO_TIMESTAMP_VALIDATOR_H_
 #define MEDIA_FILTERS_AUDIO_TIMESTAMP_VALIDATOR_H_
 
 #include "base/memory/ref_counted.h"
 #include "base/time/time.h"
 #include "media/base/audio_buffer.h"
 #include "media/base/audio_decoder_config.h"
 #include "media/base/audio_timestamp_helper.h"
 #include "media/base/decoder_buffer.h"
 #include "media/base/media_log.h"
 #include "media/base/timestamp_constants.h"
 
 namespace media {
 
 class MEDIA_EXPORT AudioTimestampValidator {
  public:
   AudioTimestampValidator(const AudioDecoderConfig& decoder_config,
-                          const scoped_refptr<MediaLog>& media_log);
+                          MediaLog* media_log);
   ~AudioTimestampValidator();
 
   // These methods monitor DecoderBuffer timestamps for gaps for the purpose of
   // warning developers when gaps may cause AV sync drift. A DecoderBuffer's
   // timestamp should roughly equal the timestamp of the previous buffer offset
   // by the previous buffer's duration.
   void CheckForTimestampGap(const scoped_refptr<DecoderBuffer>& buffer);
   void RecordOutputDuration(const scoped_refptr<AudioBuffer>& buffer);
 
  private:
   bool has_codec_delay_;
-  scoped_refptr<MediaLog> media_log_;
+  MediaLog* media_log_;
 
   // Accumulates time from decoded audio frames. We adjust the base timestamp as
   // needed for the first few buffers (stabilization period) of decoded output
   // to account for pre-skip and codec delay. See CheckForTimestampGap().
   std::unique_ptr<AudioTimestampHelper> audio_output_ts_helper_;
 
   base::TimeDelta audio_base_ts_;
 
   // Initially false, set to true when we observe gap between encoded timestamps
   // match gap between output decoder buffers.
@@ skipping 13 matching lines @@
   // the detected gap amount. This avoids log spam while still emitting
   // logs if things get worse. See CheckTimestampForGap().
   uint32_t drift_warning_threshold_msec_;
 
   DISALLOW_COPY_AND_ASSIGN(AudioTimestampValidator);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_FILTERS_AUDIO_TIMESTAMP_VALIDATOR_H_