Remove assorted unnecessary includes in core/layout/

third_party/WebKit/Source/core/layout/LayoutScrollbarPart.cpp

 /*
  * Copyright (C) 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
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 12 matching lines @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include "core/layout/LayoutScrollbarPart.h"
 
 #include "core/frame/FrameView.h"
 #include "core/frame/UseCounter.h"
 #include "core/layout/LayoutScrollbar.h"
 #include "core/layout/LayoutScrollbarTheme.h"
 #include "core/layout/LayoutView.h"
-#include "core/paint/PaintLayerScrollableArea.h"
 #include "platform/LengthFunctions.h"
 
 namespace blink {
 
 LayoutScrollbarPart::LayoutScrollbarPart(ScrollableArea* scrollableArea, LayoutScrollbar* scrollbar, ScrollbarPart part)
     : LayoutBlock(nullptr)
     , m_scrollableArea(scrollableArea)
     , m_scrollbar(scrollbar)
     , m_part(part)
 {
@@ skipping 174 matching lines @@
 }
 
 LayoutRect LayoutScrollbarPart::visualRect() const
 {
     // This returns the combined bounds of all scrollbar parts, which is sufficient for correctness
     // but not as tight as it could be.
     return m_scrollableArea->visualRectForScrollbarParts();
 }
 
 } // namespace blink