Don't include LayoutObject-derived headers where not needed.

third_party/WebKit/Source/modules/accessibility/AXSpinButton.cpp

 /*
  * Copyright (C) 2011 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
  *     notice, this list of conditions and the following disclaimer in the
  *     documentation and/or other materials provided with the distribution.
  *
  * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (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 "modules/accessibility/AXSpinButton.h"
 
-#include "core/layout/LayoutObject.h"
+#include "SkMatrix44.h"
 #include "modules/accessibility/AXObjectCacheImpl.h"
 
 namespace blink {
 
 AXSpinButton* AXSpinButton::create(AXObjectCacheImpl& axObjectCache) {
   return new AXSpinButton(axObjectCache);
 }
 
 AXSpinButton::AXSpinButton(AXObjectCacheImpl& axObjectCache)
     : AXMockObject(axObjectCache), m_spinButtonElement(nullptr) {}
@@ skipping 96 matching lines @@
   AXSpinButton* spinButton = toAXSpinButton(parentObject());
   if (m_isIncrementor)
     spinButton->step(1);
   else
     spinButton->step(-1);
 
   return true;
 }
 
 }  // namespace blink