MSE: Relax the 'media segment must begin with keyframe' requirement

media/formats/webm/webm_stream_parser.h

Index: media/formats/webm/webm_stream_parser.h
diff --git a/media/formats/webm/webm_stream_parser.h b/media/formats/webm/webm_stream_parser.h
index bb53c9440d16984178b5675aff4d14b149f8c7aa..56c63c0ad4af28b682d24d75111201a4ebec174f 100644
--- a/media/formats/webm/webm_stream_parser.h
+++ b/media/formats/webm/webm_stream_parser.h
@@ -27,7 +27,7 @@ class WebMStreamParser : public StreamParser {
             const NewBuffersCB& new_buffers_cb,
             bool ignore_text_tracks,
             const EncryptedMediaInitDataCB& encrypted_media_init_data_cb,
-            const NewMediaSegmentCB& new_segment_cb,
+            const base::Closure& start_of_segment_cb,
             const base::Closure& end_of_segment_cb,
             const scoped_refptr<MediaLog>& media_log) override;
   void Flush() override;
@@ -72,7 +72,7 @@ class WebMStreamParser : public StreamParser {
   bool ignore_text_tracks_;
   EncryptedMediaInitDataCB encrypted_media_init_data_cb_;
 
-  NewMediaSegmentCB new_segment_cb_;
+  base::Closure start_of_segment_cb_;
   base::Closure end_of_segment_cb_;
   scoped_refptr<MediaLog> media_log_;