Rename usesOverlayScrollbars of settings to mockScrollbarsUseOverlay

Source/core/testing/Internals.cpp

Index: Source/core/testing/Internals.cpp
diff --git a/Source/core/testing/Internals.cpp b/Source/core/testing/Internals.cpp
index d69a97cd433d42b69c537e599a32d2d7c3f0ee8f..c474ea694c33a6ad1ec35b6845dbcc91cc861cc8 100644
--- a/Source/core/testing/Internals.cpp
+++ b/Source/core/testing/Internals.cpp
@@ -195,7 +195,6 @@ void Internals::resetToConsistentState(Page* page)
     page->setPagination(Pagination());
     TextRun::setAllowsRoundingHacks(false);
     WebCore::overrideUserPreferredLanguages(Vector<String>());
-    WebCore::Settings::setUsesOverlayScrollbars(false);
     delete s_pagePopupDriver;
     s_pagePopupDriver = 0;
     page->chrome().client().resetPagePopupDriver();
@@ -2140,11 +2139,6 @@ PassRefPtr<SerializedScriptValue> Internals::deserializeBuffer(PassRefPtr<ArrayB
     return SerializedScriptValue::createFromWire(value);
 }
 
-void Internals::setUsesOverlayScrollbars(bool enabled)
-{
-    WebCore::Settings::setUsesOverlayScrollbars(enabled);
-}
-
 void Internals::forceReload(bool endToEnd)
 {
     frame()->loader()->reload(endToEnd ? EndToEndReload : NormalReload);