Avoid unnecessary wtf/text/WTFString.h includes in platform/heap/

third_party/WebKit/Source/core/dom/DOMException.h

 /*
  * Copyright (C) 2007, 2008 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
@@ skipping 15 matching lines @@
  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef DOMException_h
 #define DOMException_h
 
 #include "bindings/core/v8/ScriptWrappable.h"
 #include "core/CoreExport.h"
 #include "platform/heap/Handle.h"
 #include "wtf/Forward.h"
+#include "wtf/text/WTFString.h"
 
 namespace blink {
 
 typedef int ExceptionCode;
 
 class CORE_EXPORT DOMException final : public GarbageCollectedFinalized<DOMException>, public ScriptWrappable {
     DEFINE_WRAPPERTYPEINFO();
 public:
     static DOMException* create(ExceptionCode, const String& sanitizedMessage = String(), const String& unsanitizedMessage = String());
 
@@ skipping 21 matching lines @@
 
     unsigned short m_code;
     String m_name;
     String m_sanitizedMessage;
     String m_unsanitizedMessage;
 };
 
 } // namespace blink
 
 #endif // DOMException_h