Bug 1420162 - Fix warning as errors bustage on a CLOSED TREE.

--HG--
extra : rebase_source : 9cb1cad05e3ea47eac21c30b0c430eaf6c56d947
extra : amend_source : 6722925ea70f0fe97b2d4b5acbb4d62e69e70125

dom/media/webrtc/MediaEngineWebRTC.h

@@ -543,7 +543,6 @@ private:
   nsString mDeviceName;
   nsCString mDeviceUUID;
 
-  int32_t mSampleFrequency;
   uint64_t mTotalFrames;
   uint64_t mLastLogFrames;