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/rtp_rtcp/source/rtcp_receiver.cc

@@ -19,11 +19,6 @@
 #include "webrtc/system_wrappers/interface/trace.h"
 #include "webrtc/system_wrappers/interface/trace_event.h"
 
-namespace
-{
-    const float FRAC = 4.294967296E9;
-}
-
 namespace webrtc {
 using namespace RTCPUtility;
 using namespace RTCPHelp;