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

third_party/WebKit/Source/platform/exported/WebRTCVoidRequest.cpp

 /*
  * Copyright (C) 2012 Google 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.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 16 matching lines @@
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include "config.h"
 
 #include "public/platform/WebRTCVoidRequest.h"
 
 #include "platform/mediastream/RTCVoidRequest.h"
 #include "wtf/PassOwnPtr.h"
+#include "wtf/text/WTFString.h"
 
 namespace blink {
 
 WebRTCVoidRequest::WebRTCVoidRequest(RTCVoidRequest* constraints)
     : m_private(constraints)
 {
 }
 
 void WebRTCVoidRequest::assign(const WebRTCVoidRequest& other)
 {
@@ skipping 11 matching lines @@
     m_private->requestSucceeded();
 }
 
 void WebRTCVoidRequest::requestFailed(const WebString& error) const
 {
     ASSERT(m_private.get());
     m_private->requestFailed(error);
 }
 
 } // namespace blink