Wire up x-google-{min,start,max}-bitrate to WebRtcVoiceMediaChannel.

webrtc/media/engine/webrtcmediaengine.h

Index: webrtc/media/engine/webrtcmediaengine.h
diff --git a/webrtc/media/engine/webrtcmediaengine.h b/webrtc/media/engine/webrtcmediaengine.h
index dae63477d678ca728b79a091ef65d2d5e76c0a60..af85b2f99f79015c25a811bd5e3069532cf6f326 100644
--- a/webrtc/media/engine/webrtcmediaengine.h
+++ b/webrtc/media/engine/webrtcmediaengine.h
@@ -14,6 +14,7 @@
 #include <string>
 #include <vector>
 
+#include "webrtc/call.h"
 #include "webrtc/config.h"
 #include "webrtc/media/base/mediaengine.h"
 
@@ -58,6 +59,9 @@ std::vector<webrtc::RtpExtension> FilterRtpExtensions(
     bool (*supported)(const std::string&),
     bool filter_redundant_extensions);
 
+webrtc::Call::Config::BitrateConfig GetBitrateConfigForCodec(
+    const Codec& codec);
+
 }  // namespace cricket
 
 #endif  // WEBRTC_MEDIA_ENGINE_WEBRTCMEDIAENGINE_H_