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

Source/wtf/Forward.h

 /*
  *  Copyright (C) 2006, 2009, 2011 Apple Inc. All rights reserved.
  *
  *  This library is free software; you can redistribute it and/or
  *  modify it under the terms of the GNU Library General Public
  *  License as published by the Free Software Foundation; either
  *  version 2 of the License, or (at your option) any later version.
  *
  *  This library is distributed in the hope that it will be useful,
  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 14 matching lines @@
 
 namespace WTF {
     template<typename T> class Function;
     template<typename T> class OwnArrayPtr;
     template<typename T> class OwnPtr;
     template<typename T> class PassOwnArrayPtr;
     template<typename T> class PassOwnPtr;
     template<typename T> class PassRefPtr;
     template<typename T> class RefPtr;
     template<typename T, size_t inlineCapacity> class Vector;
-    
+
     class ArrayBuffer;
     class ArrayBufferView;
     class AtomicString;
     class CString;
     class Float32Array;
     class Float64Array;
     class Int8Array;
     class Int16Array;
     class Int32Array;
     class String;
@@ skipping 27 matching lines @@
 using WTF::String;
 using WTF::StringBuffer;
 using WTF::StringBuilder;
 using WTF::StringImpl;
 using WTF::Uint8Array;
 using WTF::Uint8ClampedArray;
 using WTF::Uint16Array;
 using WTF::Uint32Array;
 
 #endif // WTF_Forward_h