MSE: Use frame duration, if available, in LegacyFrameProcessor

media/filters/legacy_frame_processor.h

Index: media/filters/legacy_frame_processor.h
diff --git a/media/filters/legacy_frame_processor.h b/media/filters/legacy_frame_processor.h
index 1de3c81f63686e052f5924bb764371398956a08e..46da312b0509c702983f309e36b62379549592fd 100644
--- a/media/filters/legacy_frame_processor.h
+++ b/media/filters/legacy_frame_processor.h
@@ -17,10 +17,9 @@ namespace media {
 // algorithm.
 class MEDIA_EXPORT LegacyFrameProcessor : public FrameProcessorBase {
  public:
-  // Callback signature used to notify ChunkDemuxer of timestamps that may cause
-  // the duration to be updated.
-  typedef base::Callback<void(
-      base::TimeDelta, ChunkDemuxerStream*)> IncreaseDurationCB;
+  // Callback signature used to notify ChunkDemuxer of an end timestamp that may
+  // cause the duration to be updated.
+  typedef base::Callback<void(base::TimeDelta)> IncreaseDurationCB;
 
   explicit LegacyFrameProcessor(const IncreaseDurationCB& increase_duration_cb);
   virtual ~LegacyFrameProcessor();