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

Source/modules/notifications/NotificationClient.h

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  * Copyright (C) 2011, 2012 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
@@ skipping 44 matching lines @@
 
     // Requests that a notification be shown.
     virtual bool show(Notification*) = 0;
 
     // Requests that a notification that has already been shown be canceled.
     virtual void cancel(Notification*) = 0;
 
     // When the user closes a page, or quits the client application, all of the page's
     // associated notifications are cleared.
     virtual void clearNotifications(ScriptExecutionContext*) { }
-    
+
     // Informs the presenter that a Notification object has been destroyed
     // (such as by a page transition). The presenter may continue showing
     // the notification, but must not attempt to call the event handlers.
     virtual void notificationObjectDestroyed(Notification*) = 0;
 
     // Informs the presenter the controller attached to the page has been destroyed.
     virtual void notificationControllerDestroyed() = 0;
 
 #if ENABLE(LEGACY_NOTIFICATIONS)
     // Requests user permission to show desktop notifications from a particular
@@ skipping 13 matching lines @@
 
 protected:
     virtual ~NotificationClient() { }
 };
 
 void provideNotification(Page*, NotificationClient*);
 
 } // namespace WebCore
 
 #endif // NotificationClient_h