Avoid calling RtpFrameObject::GetCodecHeader twice in the RtpFrameReferenceFinder.

webrtc/modules/video_coding/rtp_frame_reference_finder.h

Index: webrtc/modules/video_coding/rtp_frame_reference_finder.h
diff --git a/webrtc/modules/video_coding/rtp_frame_reference_finder.h b/webrtc/modules/video_coding/rtp_frame_reference_finder.h
index 74db45a2b8036a4d03ac846bcfa23686b2c14747..f31ee6435c820895e624d95cb605c4674940a102 100644
--- a/webrtc/modules/video_coding/rtp_frame_reference_finder.h
+++ b/webrtc/modules/video_coding/rtp_frame_reference_finder.h
@@ -99,7 +99,8 @@ class RtpFrameReferenceFinder {
 
   // Updates necessary layer info state used to determine frame references for
   // Vp8.
-  void UpdateLayerInfoVp8(RtpFrameObject* frame)
+  void UpdateLayerInfoVp8(RtpFrameObject* frame,
+                          const RTPVideoHeaderVP8& codec_header)
       EXCLUSIVE_LOCKS_REQUIRED(crit_);
 
   // Find references for Vp9 frames