Fix trailing whitespace in .cpp, .h, and .idl files (ex. Source/core)

public/platform/WebRTCStatsRequest.h

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 43 matching lines @@
 // The typical usage pattern is:
 // WebRTCStatsRequest request = <from somewhere>
 // WebRTCStatsResponse response = request.createResponse();
 //
 // For each item on which statistics are going to be reported:
 //   size_t reportIndex = response.addReport();
 //   Add local information:
 //   size_t elementIndex = response.addElement(reportIndex, true, dateNow());
 //   For each statistic being reported on:
 //     response.addStatistic(reportIndex, true, elementIndex,
-//                           "name of statistic", "statistic value"); 
+//                           "name of statistic", "statistic value");
 //   Remote information (typically RTCP-derived) is added in the same way.
 // When finished adding information:
 // request.requestSucceeded(response);
 
 class WebRTCStatsRequest {
 public:
     WebRTCStatsRequest() { }
     WebRTCStatsRequest(const WebRTCStatsRequest& other) { assign(other); }
     ~WebRTCStatsRequest() { reset(); }
 
@@ skipping 25 matching lines @@
     WebRTCStatsRequest(const WTF::PassRefPtr<WebCore::RTCStatsRequest>&);
 #endif
 
 private:
     WebPrivatePtr<WebCore::RTCStatsRequest> m_private;
 };
 
 } // namespace WebKit
 
 #endif // WebRTCStatsRequest_h