Eliminate unnecessary includes of LayoutBlockFlow-derived headers.

third_party/WebKit/Source/core/html/shadow/ClearButtonElement.cpp

 /*
  * Copyright (C) 2013 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:
  * 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
  *     notice, this list of conditions and the following disclaimer in the
@@ skipping 11 matching lines @@
  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
  */
 
 #include "core/html/shadow/ClearButtonElement.h"
 
 #include "core/events/MouseEvent.h"
 #include "core/frame/LocalFrame.h"
 #include "core/html/shadow/ShadowElementNames.h"
 #include "core/input/EventHandler.h"
-#include "core/layout/LayoutView.h"
+#include "core/layout/LayoutObject.h"
 
 namespace blink {
 
 using namespace HTMLNames;
 
 inline ClearButtonElement::ClearButtonElement(Document& document, ClearButtonOwner& clearButtonOwner)
     : HTMLDivElement(document)
     , m_clearButtonOwner(&clearButtonOwner)
 {
 }
@@ skipping 42 matching lines @@
     return true;
 }
 
 DEFINE_TRACE(ClearButtonElement)
 {
     visitor->trace(m_clearButtonOwner);
     HTMLDivElement::trace(visitor);
 }
 
 } // namespace blink