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

Source/modules/notifications/DOMWindowNotifications.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
  *
  * 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
@@ skipping 72 matching lines @@
 {
     if (!m_window->isCurrentlyDisplayedInFrame())
         return 0;
 
     if (m_notificationCenter)
         return m_notificationCenter.get();
 
     Document* document = m_window->document();
     if (!document)
         return 0;
-    
+
     Page* page = document->page();
     if (!page)
         return 0;
 
     NotificationClient* provider = NotificationController::clientFrom(page);
-    if (provider) 
-        m_notificationCenter = NotificationCenter::create(document, provider);    
+    if (provider)
+        m_notificationCenter = NotificationCenter::create(document, provider);
 
     return m_notificationCenter.get();
 }
 
 } // namespace WebCore
 
 #endif // ENABLE(NOTIFICATIONS) || ENABLE(LEGACY_NOTIFICATIONS)