Make the constructor of a LayoutRect from an IntRect explicit.

Source/core/layout/LayerScrollableArea.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 1019 matching lines @@
         IntRect hBarRect = rectForHorizontalScrollbar(borderBox);
         hBarRect.move(offsetFromRoot);
         horizontalScrollbar->setFrameRect(hBarRect);
     }
 
     const IntRect& scrollCorner = scrollCornerRect();
     if (m_scrollCorner)
         m_scrollCorner->setFrameRect(LayoutRect(scrollCorner));
 
     if (m_resizer)
-        m_resizer->setFrameRect(resizerCornerRect(borderBox, ResizerForPointer));
+        m_resizer->setFrameRect(LayoutRect(resizerCornerRect(borderBox, ResizerForPointer)));
 
     // FIXME, this should eventually be removed, once we are certain that composited
     // controls get correctly positioned on a compositor update. For now, conservatively
     // leaving this unchanged.
     if (layer()->hasCompositedLayerMapping())
         layer()->compositedLayerMapping()->positionOverflowControlsLayers(offsetFromRoot);
 }
 
 void LayerScrollableArea::updateScrollCornerStyle()
 {
@@ skipping 331 matching lines @@
 void LayerScrollableArea::setTopmostScrollChild(Layer* scrollChild)
 {
     // We only want to track the topmost scroll child for scrollable areas with
     // overlay scrollbars.
     if (!hasOverlayScrollbars())
         return;
     m_nextTopmostScrollChild = scrollChild;
 }
 
 } // namespace blink