Move timestamp_extrapolator and rtp_to_ntp to system wrapper so that it can be shared by both audio and video engine.

BUG=3111
TEST=try bots
R=mflodman@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/13459004

git-svn-id: http://webrtc.googlecode.com/svn/trunk/webrtc@6074 4adac7df-926f-26a2-2b94-8c16560cd09d
diff --git a/video_engine/stream_synchronization.h b/video_engine/stream_synchronization.h
index 078b938..5fa9536 100644
--- a/video_engine/stream_synchronization.h
+++ b/video_engine/stream_synchronization.h
@@ -13,7 +13,7 @@
 
 #include <list>
 
-#include "webrtc/modules/remote_bitrate_estimator/include/rtp_to_ntp.h"
+#include "webrtc/system_wrappers/interface/rtp_to_ntp.h"
 #include "webrtc/typedefs.h"
 
 namespace webrtc {
@@ -24,7 +24,7 @@
  public:
   struct Measurements {
     Measurements() : rtcp(), latest_receive_time_ms(0), latest_timestamp(0) {}
-    synchronization::RtcpList rtcp;
+    RtcpList rtcp;
     int64_t latest_receive_time_ms;
     uint32_t latest_timestamp;
   };