Rename usesOverlayScrollbars of settings to mockScrollbarsUseOverlay

Source/core/page/Settings.h

 /*
  * Copyright (C) 2003, 2006, 2007, 2008, 2009, 2011, 2012 Apple Inc. All rights reserved.
  *           (C) 2006 Graham Dennis (graham.dennis@gmail.com)
  *
  * 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
@@ skipping 124 matching lines @@
 
     void setCSSCustomFilterEnabled(bool enabled) { m_isCSSCustomFilterEnabled = enabled; }
     bool isCSSCustomFilterEnabled() const { return m_isCSSCustomFilterEnabled; }
 
     void setCSSStickyPositionEnabled(bool enabled) { m_cssStickyPositionEnabled = enabled; }
     bool cssStickyPositionEnabled() const { return m_cssStickyPositionEnabled; }
 
     static void setMockScrollbarsEnabled(bool flag);
     static bool mockScrollbarsEnabled();
 
-    static void setUsesOverlayScrollbars(bool flag);
-    static bool usesOverlayScrollbars();
+    static void setMockScrollbarsUseOverlay(bool flag);
+    static bool mockScrollbarsUseOverlay();
 
     void setTouchEventEmulationEnabled(bool enabled) { m_touchEventEmulationEnabled = enabled; }
     bool isTouchEventEmulationEnabled() const { return m_touchEventEmulationEnabled; }
 
     void setOpenGLMultisamplingEnabled(bool flag);
     bool openGLMultisamplingEnabled();
 
     void setViewportEnabled(bool);
     bool viewportEnabled() const { return m_viewportEnabled; }
 
@@ skipping 38 matching lines @@
     bool m_viewportEnabled : 1;
 
     // FIXME: This is a temporary flag and should be removed once accelerated
     // overflow scroll is ready (crbug.com/254111).
     bool m_compositorDrivenAcceleratedScrollingEnabled : 1;
 
     Timer<Settings> m_setImageLoadingSettingsTimer;
     void imageLoadingSettingsTimerFired(Timer<Settings>*);
 
     static bool gMockScrollbarsEnabled;
-    static bool gUsesOverlayScrollbars;
+    static bool gMockScrollbarsUseOverlay;
 };
 
 } // namespace WebCore
 
 #endif // Settings_h