Return a copy of the supported RTP header extensions instead of a reference.

talk/media/webrtc/webrtcvideoengine2.h

 /*
  * libjingle
  * Copyright 2014 Google Inc.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
  *
  *  1. Redistributions of source code must retain the above copyright notice,
  *     this list of conditions and the following disclaimer.
  *  2. Redistributions in binary form must reproduce the above copyright notice,
@@ skipping 100 matching lines @@
 
   // Basic video engine implementation.
   void Init();
 
   bool SetDefaultEncoderConfig(const VideoEncoderConfig& config);
 
   WebRtcVideoChannel2* CreateChannel(webrtc::Call* call,
                                      const VideoOptions& options);
 
   const std::vector<VideoCodec>& codecs() const;
-  const std::vector<RtpHeaderExtension>& rtp_header_extensions() const;
+  RtpCapabilities GetCapabilities() const;
 
   // Set a WebRtcVideoDecoderFactory for external decoding. Video engine does
   // not take the ownership of |decoder_factory|. The caller needs to make sure
   // that |decoder_factory| outlives the video engine.
   void SetExternalDecoderFactory(WebRtcVideoDecoderFactory* decoder_factory);
   // Set a WebRtcVideoEncoderFactory for external encoding. Video engine does
   // not take the ownership of |encoder_factory|. The caller needs to make sure
   // that |encoder_factory| outlives the video engine.
   virtual void SetExternalEncoderFactory(
       WebRtcVideoEncoderFactory* encoder_factory);
 
   bool EnableTimedRender();
 
   bool FindCodec(const VideoCodec& in);
   bool CanSendCodec(const VideoCodec& in,
                     const VideoCodec& current,
                     VideoCodec* out);
   // Check whether the supplied trace should be ignored.
   bool ShouldIgnoreTrace(const std::string& trace);
 
  private:
   std::vector<VideoCodec> GetSupportedCodecs() const;
 
   std::vector<VideoCodec> video_codecs_;
-  std::vector<RtpHeaderExtension> rtp_header_extensions_;
 
   bool initialized_;
 
   WebRtcVideoDecoderFactory* external_decoder_factory_;
   WebRtcVideoEncoderFactory* external_encoder_factory_;
   rtc::scoped_ptr<WebRtcVideoEncoderFactory> simulcast_encoder_factory_;
 };
 
 class WebRtcVideoChannel2 : public rtc::MessageHandler,
                             public VideoMediaChannel,
@@ skipping 367 matching lines @@
   WebRtcVideoDecoderFactory* const external_decoder_factory_;
   std::vector<VideoCodecSettings> recv_codecs_;
   std::vector<webrtc::RtpExtension> recv_rtp_extensions_;
   webrtc::Call::Config::BitrateConfig bitrate_config_;
   VideoOptions options_;
 };
 
 }  // namespace cricket
 
 #endif  // TALK_MEDIA_WEBRTC_WEBRTCVIDEOENGINE2_H_