Deprecate LogCB in favor of using MediaLog

media/formats/webm/webm_video_client.h

Index: media/formats/webm/webm_video_client.h
diff --git a/media/formats/webm/webm_video_client.h b/media/formats/webm/webm_video_client.h
index 8e246d9a7849d4e2b3c6f4c226022d04a588c132..f2f1df4c9fd330123aec126a52614ea9ac794da6 100644
--- a/media/formats/webm/webm_video_client.h
+++ b/media/formats/webm/webm_video_client.h
@@ -17,7 +17,7 @@ class VideoDecoderConfig;
 // Helper class used to parse a Video element inside a TrackEntry element.
 class WebMVideoClient : public WebMParserClient {
  public:
-  explicit WebMVideoClient(const LogCB& log_cb);
+  explicit WebMVideoClient(const scoped_refptr<MediaLog>& media_log);
   ~WebMVideoClient() override;
 
   // Reset this object's state so it can process a new video track element.
@@ -41,7 +41,7 @@ class WebMVideoClient : public WebMParserClient {
   bool OnBinary(int id, const uint8* data, int size) override;
   bool OnFloat(int id, double val) override;
 
-  LogCB log_cb_;
+  scoped_refptr<MediaLog> media_log_;
   int64 pixel_width_;
   int64 pixel_height_;
   int64 crop_bottom_;