Rename usesOverlayScrollbars of settings to mockScrollbarsUseOverlay

Source/core/platform/ScrollbarTheme.cpp

 /*
  * Copyright (C) 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 19 matching lines @@
 #include "core/platform/ScrollbarThemeClient.h"
 #include "core/platform/graphics/GraphicsContext.h"
 #include "core/platform/mock/ScrollbarThemeMock.h"
 #include "core/platform/mock/ScrollbarThemeOverlayMock.h"
 
 namespace WebCore {
 
 ScrollbarTheme* ScrollbarTheme::theme()
 {
     if (Settings::mockScrollbarsEnabled()) {
-        if (Settings::usesOverlayScrollbars()) {
+        if (Settings::mockScrollbarsUseOverlay()) {
             DEFINE_STATIC_LOCAL(ScrollbarThemeOverlayMock, overlayMockTheme, ());
             return &overlayMockTheme;
         }
 
         DEFINE_STATIC_LOCAL(ScrollbarThemeMock, mockTheme, ());
         return &mockTheme;
     }
     return nativeTheme();
 }
 
@@ skipping 250 matching lines @@
 void ScrollbarTheme::paintOverhangBackground(ScrollView*, GraphicsContext* context, const IntRect& horizontalOverhangRect, const IntRect& verticalOverhangRect, const IntRect& dirtyRect)
 {
     context->setFillColor(Color::white);
     if (!horizontalOverhangRect.isEmpty())
         context->fillRect(intersection(horizontalOverhangRect, dirtyRect));
     if (!verticalOverhangRect.isEmpty())
         context->fillRect(intersection(verticalOverhangRect, dirtyRect));
 }
 
 }