Fix const correctness of containerForRepaint

Source/core/rendering/svg/RenderSVGModelObject.cpp

 /*
  * Copyright (c) 2009, Google 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 120 matching lines @@
     ASSERT(RuntimeEnabledFeatures::repaintAfterLayoutEnabled());
     ASSERT(!needsLayout());
 
     if (!shouldCheckForInvalidationAfterLayout())
         return;
 
     LayoutStateDisabler layoutStateDisabler(*this);
 
     const LayoutRect oldRepaintRect = previousRepaintRect();
     const LayoutPoint oldPositionFromRepaintContainer = previousPositionFromRepaintContainer();
-    RenderLayerModelObject* repaintContainer = containerForRepaint();
+    const RenderLayerModelObject* repaintContainer = containerForRepaint();
     setPreviousRepaintRect(clippedOverflowRectForRepaint(repaintContainer));
     setPreviousPositionFromRepaintContainer(positionFromRepaintContainer(repaintContainer));
 
     // If we are set to do a full repaint that means the RenderView will be
     // invalidated. We can then skip issuing of invalidations for the child
     // renderers as they'll be covered by the RenderView.
     if (view()->doingFullRepaint()) {
         RenderObject::repaintTreeAfterLayout();
         return;
     }
 
     const LayoutRect& newRepaintRect = previousRepaintRect();
     const LayoutPoint& newPositionFromRepaintContainer = previousPositionFromRepaintContainer();
     repaintAfterLayoutIfNeeded(containerForRepaint(),
         shouldDoFullRepaintAfterLayout(), oldRepaintRect, oldPositionFromRepaintContainer, &newRepaintRect, &newPositionFromRepaintContainer);
 
     RenderObject::repaintTreeAfterLayout();
 }
 
 } // namespace WebCore