Remove operator overloading from RTPFragmentationHeader.

Instead supply a CopyFrom() method.

TEST=vie_auto_test

Review URL: https://webrtc-codereview.appspot.com/972004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@3158 4adac7df-926f-26a2-2b94-8c16560cd09d
diff --git a/webrtc/modules/utility/source/video_coder.cc b/webrtc/modules/utility/source/video_coder.cc
index 3f9bffa..cc33161 100644
--- a/webrtc/modules/utility/source/video_coder.cc
+++ b/webrtc/modules/utility/source/video_coder.cc
@@ -142,7 +142,7 @@
     _videoEncodedData->frameType = frameType;
     _videoEncodedData->payloadType = payloadType;
     _videoEncodedData->timeStamp = timeStamp;
-    _videoEncodedData->fragmentationHeader = fragmentationHeader;
+    _videoEncodedData->fragmentationHeader.CopyFrom(fragmentationHeader);
     memcpy(_videoEncodedData->payloadData, payloadData,
            sizeof(WebRtc_UWord8) * payloadSize);
     _videoEncodedData->payloadSize = payloadSize;