Delete odd assignment of IgnoreOverlayScrollbarSize

Source/core/rendering/RenderLayerClipper.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011, 2012 Apple Inc. All rights reserved.
  *
  * Portions are Copyright (C) 1998 Netscape Communications Corporation.
  *
  * Other contributors:
  *   Robert O'Callahan <roc+@cs.cmu.edu>
  *   David Baron <dbaron@fas.harvard.edu>
  *   Christian Biesinger <cbiesinger@web.de>
  *   Randall Jesup <rjesup@wgate.com>
@@ skipping 226 matching lines @@
     // For transformed layers, the root layer was shifted to be us, so there is no need to
     // examine the parent. We want to cache clip rects with us as the root.
     RenderLayer* parentLayer = !isClippingRoot ? m_renderer.layer()->parent() : 0;
 
     // Ensure that our parent's clip has been calculated so that we can examine the values.
     if (parentLayer) {
         // FIXME: Why don't we just call updateClipRects here?
         if (context.usesCache() && parentLayer->clipper().cachedClipRects(context)) {
             clipRects = *parentLayer->clipper().cachedClipRects(context);
         } else {
-            ClipRectsContext parentContext(context);
-            parentContext.scrollbarRelevancy = IgnoreOverlayScrollbarSize; // FIXME: why?

[chrishtr, 2014/06/27 22:00:29]

Does IgnoreOverlayScrollbarSize ever do anything here? I can't quite find the
place where it would. ScrollableArea seems to be the only place that cares?
Anyway just checking if this is actually dead.

-            parentLayer->clipper().calculateClipRects(parentContext, clipRects);
+            parentLayer->clipper().calculateClipRects(context, clipRects);
         }
     } else {
         clipRects.reset(PaintInfo::infiniteRect());
     }
 
     // A fixed object is essentially the root of its containing block hierarchy, so when
     // we encounter such an object, we reset our clip rects to the fixedClipRect.
     if (m_renderer.style()->position() == FixedPosition) {
         clipRects.setPosClipRect(clipRects.fixedClipRect());
         clipRects.setOverflowClipRect(clipRects.fixedClipRect());
@@ skipping 111 matching lines @@
         ASSERT(current);
         if (current->transform() || current->isPaintInvalidationContainer())
             return const_cast<RenderLayer*>(current);
     }
 
     ASSERT_NOT_REACHED();
     return 0;
 }
 
 } // namespace WebCore