Build WebRTC with data channel only.

webrtc/media/base/codec.cc

Index: webrtc/media/base/codec.cc
diff --git a/webrtc/media/base/codec.cc b/webrtc/media/base/codec.cc
index 1e305a60b71369e41b797e6b388f15b33f0f7438..c76b8003db33d695f3c1257e1d6822677f012c79 100644
--- a/webrtc/media/base/codec.cc
+++ b/webrtc/media/base/codec.cc
@@ -21,16 +21,8 @@
 
 namespace cricket {
 
-static bool IsSameH264Profile(const CodecParameterMap& params1,
-                              const CodecParameterMap& params2) {
-  const rtc::Optional<webrtc::H264::ProfileLevelId> profile_level_id =
-      webrtc::H264::ParseSdpProfileLevelId(params1);
-  const rtc::Optional<webrtc::H264::ProfileLevelId> other_profile_level_id =
-      webrtc::H264::ParseSdpProfileLevelId(params2);
-  // Compare H264 profiles, but not levels.
-  return profile_level_id && other_profile_level_id &&
-         profile_level_id->profile == other_profile_level_id->profile;
-}
+bool IsSameH264Profile(const CodecParameterMap& params1,
+                       const CodecParameterMap& params2);
 
 bool FeedbackParam::operator==(const FeedbackParam& other) const {
   return _stricmp(other.id().c_str(), id().c_str()) == 0 &&