Refactor fixed layout mode

Source/core/platform/ScrollableArea.h

 /*
  * 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:
  * 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 123 matching lines @@
 
     virtual Scrollbar* horizontalScrollbar() const { return 0; }
     virtual Scrollbar* verticalScrollbar() const { return 0; }
 
     // scrollPosition is relative to the scrollOrigin. i.e. If the page is RTL
     // then scrollPosition will be negative.
     virtual IntPoint scrollPosition() const = 0;
     virtual IntPoint minimumScrollPosition() const = 0;
     virtual IntPoint maximumScrollPosition() const = 0;
 
-    enum VisibleContentRectIncludesScrollbars { ExcludeScrollbars, IncludeScrollbars };
-    virtual IntRect visibleContentRect(VisibleContentRectIncludesScrollbars = ExcludeScrollbars) const;
+    enum IncludeScrollbarsInRect { ExcludeScrollbars, IncludeScrollbars };
+    virtual IntRect visibleContentRect(IncludeScrollbarsInRect = ExcludeScrollbars) const;
     virtual int visibleHeight() const = 0;
     virtual int visibleWidth() const = 0;
     virtual IntSize contentsSize() const = 0;
     virtual IntSize overhangAmount() const { return IntSize(); }
     virtual IntPoint lastKnownMousePosition() const { return IntPoint(); }
 
     virtual bool shouldSuspendScrollAnimations() const { return true; }
     virtual void scrollbarStyleChanged(int /*newStyle*/, bool /*forceUpdate*/) { }
 
     virtual bool scrollbarsCanBeActive() const = 0;
@@ skipping 91 matching lines @@
     // vertical-lr / ltr            NO                      NO
     // vertical-lr / rtl            NO                      YES
     // vertical-rl / ltr            YES                     NO
     // vertical-rl / rtl            YES                     YES
     IntPoint m_scrollOrigin;
 };
 
 } // namespace WebCore
 
 #endif // ScrollableArea_h