Fix a bug in passing the RTP header from P2PSocketHost to WebRtcLogggingHandlerHost.

chrome/browser/media/webrtc_rtp_dump_writer.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/media/webrtc_rtp_dump_writer.h"
 
 #include "base/big_endian.h"
 #include "base/file_util.h"
 #include "base/logging.h"
 #include "content/public/browser/browser_thread.h"
@@ skipping 53 matching lines @@
   output->resize(output->size() + kPacketDumpHeaderSize);
 
   char* buffer = reinterpret_cast<char*>(&(*output)[buffer_start_pos]);
 
   base::WriteBigEndian(buffer, dump_length);
   buffer += sizeof(dump_length);
 
   base::WriteBigEndian(buffer, packet_length);
   buffer += sizeof(packet_length);
 
-  base::WriteBigEndian(buffer,
-                       (base::TimeTicks::Now() - start).InMilliseconds());
+  uint32 elapsed =
+      static_cast<uint32>((base::TimeTicks::Now() - start).InMilliseconds());
+  base::WriteBigEndian(buffer, elapsed);
 }
 
 // Append |src_len| bytes from |src| to |dest|.
 void AppendToBuffer(const uint8* src,
                     size_t src_len,
                     std::vector<uint8>* dest) {
   size_t old_dest_size = dest->size();
   dest->resize(old_dest_size + src_len);
   memcpy(&(*dest)[old_dest_size], src, src_len);
 }
@@ skipping 355 matching lines @@
                 true,
                 base::Bind(&WebRtcRtpDumpWriter::OnDumpEnded,
                            weak_ptr_factory_.GetWeakPtr(),
                            context,
                            false));
     return;
   }
 
   context.callback.Run(context.incoming_succeeded, context.outgoing_succeeded);
 }