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

Tools/DumpRenderTree/TestNetscapePlugIn/Tests/DocumentOpenInDestroyStream.cpp

 /*
  * Copyright (C) 2010 Apple 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 28 matching lines @@
     {
     }
 
 private:
     virtual NPError NPP_DestroyStream(NPStream*, NPReason)
     {
         if (m_shouldOpen) {
             testDocumentOpen(m_npp);
             m_shouldOpen = false;
         }
-        
+
         return NPERR_NO_ERROR;
-    }        
+    }
 
     bool m_shouldOpen;
 };
 
 static PluginTest::Register<DocumentOpenInDestroyStream> documentOpenInDestroyStream("document-open-in-destroy-stream");