Allow objects without scrollbars to be scrollable

Source/core/rendering/RenderLayerCompositor.cpp

 /*
  * Copyright (C) 2009, 2010 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 2172 matching lines @@
 }
 
 #if ENABLE(RUBBER_BANDING)
 bool RenderLayerCompositor::requiresOverhangAreasLayer() const
 {
     // We don't want a layer if this is a subframe.
     if (!isMainFrame())
         return false;
 
     // We do want a layer if we have a scrolling coordinator and can scroll.
-    if (scrollingCoordinator() && m_renderView->frameView()->hasOpaqueBackground() && !m_renderView->frameView()->prohibitsScrolling())
+    if (scrollingCoordinator() && m_renderView->frameView()->hasOpaqueBackground())
         return true;
 
     // Chromium always wants a layer.
     return true;
 }
 
 bool RenderLayerCompositor::requiresContentShadowLayer() const
 {
     // We don't want a layer if this is a subframe.
     if (!isMainFrame())
@@ skipping 547 matching lines @@
     info.addMember(m_layerForScrollCorner, "layerForScrollCorner");
 #if ENABLE(RUBBER_BANDING)
     info.addMember(m_layerForOverhangAreas, "layerForOverhangAreas");
     info.addMember(m_contentShadowLayer, "contentShadowLayer");
     info.addMember(m_layerForTopOverhangArea, "layerForTopOverhangArea");
     info.addMember(m_layerForBottomOverhangArea, "layerForBottomOverhangArea");
 #endif
 }
 
 } // namespace WebCore