Change default timestamp to 64 bits in all webrtc directories.

webrtc/libjingle/xmpp/pingtask.h

 /*
  *  Copyright 2011 The WebRTC Project Authors. All rights reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 28 matching lines @@
   // The task is automatically aborted after a timeout.
   sigslot::signal0<> SignalTimeout;
 
  private:
   // Implementation of MessageHandler.
   virtual void OnMessage(rtc::Message* msg);
 
   rtc::MessageQueue* message_queue_;
   uint32_t ping_period_millis_;
   uint32_t ping_timeout_millis_;
-  uint32_t next_ping_time_;
-  uint32_t ping_response_deadline_;  // 0 if the response has been received
+  int64_t next_ping_time_;
+  int64_t ping_response_deadline_;  // 0 if the response has been received
 };
 
 } // namespace buzz
 
 #endif  // WEBRTC_LIBJINGLE_XMPP_PINGTASK_H_