Remove unused constants, so chrome can enable a warning for that. Patch from thakis@

R=andrew@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/2296006

git-svn-id: http://webrtc.googlecode.com/svn/trunk@4844 4adac7df-926f-26a2-2b94-8c16560cd09d

webrtc/modules/remote_bitrate_estimator/rtp_to_ntp.cc

@@ -18,8 +18,6 @@ namespace webrtc {
 
 namespace synchronization {
 
-const double kNtpFracPerMs = 4.294967296E6;
-
 RtcpMeasurement::RtcpMeasurement()
     : ntp_secs(0), ntp_frac(0), rtp_timestamp(0) {}