Refactor fixed layout mode

Source/core/platform/ScrollableArea.cpp

 /*
  * Copyright (c) 2010, Google Inc. All rights reserved.
  * Copyright (C) 2008, 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
@@ skipping 361 matching lines @@
 {
     return layerForScrollCorner();
 }
 
 void ScrollableArea::serviceScrollAnimations()
 {
     if (ScrollAnimator* scrollAnimator = existingScrollAnimator())
         scrollAnimator->serviceScrollAnimations();
 }
 
-IntRect ScrollableArea::visibleContentRect(VisibleContentRectIncludesScrollbars scrollbarInclusion) const
+IntRect ScrollableArea::visibleContentRect(IncludeScrollbarsInRect scrollbarInclusion) const
 {
     int verticalScrollbarWidth = 0;
     int horizontalScrollbarHeight = 0;
 
     if (scrollbarInclusion == IncludeScrollbars) {
         if (Scrollbar* verticalBar = verticalScrollbar())
             verticalScrollbarWidth = !verticalBar->isOverlayScrollbar() ? verticalBar->width() : 0;
         if (Scrollbar* horizontalBar = horizontalScrollbar())
             horizontalScrollbarHeight = !horizontalBar->isOverlayScrollbar() ? horizontalBar->height() : 0;
     }
@@ skipping 18 matching lines @@
 {
     return scrollSize(orientation);
 }
 
 float ScrollableArea::pixelStep(ScrollbarOrientation) const
 {
     return 1;
 }
 
 } // namespace WebCore