Rename RTP-extension constants.

BUG=
R=mflodman@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/3969004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@5137 4adac7df-926f-26a2-2b94-8c16560cd09d
diff --git a/webrtc/config.h b/webrtc/config.h
index a00a8f9..3ff3bb8 100644
--- a/webrtc/config.h
+++ b/webrtc/config.h
@@ -16,6 +16,8 @@
 #include <string>
 #include <vector>
 
+#include "webrtc/typedefs.h"
+
 namespace webrtc {
 
 struct RtpStatistics {
@@ -67,6 +69,8 @@
 
 // RTP header extension to use for the video stream, see RFC 5285.
 struct RtpExtension {
+  static const char* kTOffset;
+  static const char* kAbsSendTime;
   RtpExtension(const char* name, int id) : name(name), id(id) {}
   // TODO(mflodman) Add API to query supported extensions.
   std::string name;