blink: Cleanup class forward declarations

third_party/WebKit/Source/core/paint/PaintInvalidationCapableScrollableArea.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef PaintInvalidationCapableScrollableArea_h
 #define PaintInvalidationCapableScrollableArea_h
 
 #include "core/CoreExport.h"
 #include "platform/geometry/LayoutRect.h"
 #include "platform/scroll/ScrollableArea.h"
 
 namespace blink {
 
-class LayoutBox;
 class LayoutScrollbarPart;
 class PaintInvalidationState;
 struct PaintInvalidatorContext;
 
 // Base class of FrameView and PaintLayerScrollableArea to share paint
 // invalidation code.
 // TODO(wangxianzhu): Combine this into PaintLayerScrollableArea when
 // root-layer-scrolls launches.
 class CORE_EXPORT PaintInvalidationCapableScrollableArea
     : public ScrollableArea {
@@ skipping 25 matching lines @@
   bool m_horizontalScrollbarPreviouslyWasOverlay;
   bool m_verticalScrollbarPreviouslyWasOverlay;
   LayoutRect m_horizontalScrollbarPreviousVisualRect;
   LayoutRect m_verticalScrollbarPreviousVisualRect;
   LayoutRect m_scrollCornerAndResizerPreviousVisualRect;
 };
 
 }  // namespace blink
 
 #endif  // PaintInvalidationCapableScrollableArea_h