Make the LayoutRect->FloatRect constructor explicit.

Source/core/paint/DeprecatedPaintLayerScrollableArea.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 395 matching lines @@
         // Update regions, scrolling may change the clip of a particular region.
         frameView->updateAnnotatedRegions();
         frameView->setNeedsUpdateWidgetPositions();
         updateCompositingLayersAfterScroll();
     }
 
     const LayoutBoxModelObject* paintInvalidationContainer = box().containerForPaintInvalidation();
     // The caret rect needs to be invalidated after scrolling
     frame->selection().setCaretRectNeedsUpdate();
 
-    FloatQuad quadForFakeMouseMoveEvent = FloatQuad(layer()->layoutObject()->previousPaintInvalidationRectIncludingCompositedScrolling(*paintInvalidationContainer));
+    FloatQuad quadForFakeMouseMoveEvent = FloatQuad(FloatRect(layer()->layoutObject()->previousPaintInvalidationRectIncludingCompositedScrolling(*paintInvalidationContainer)));
 
     quadForFakeMouseMoveEvent = paintInvalidationContainer->localToAbsoluteQuad(quadForFakeMouseMoveEvent);
     frame->eventHandler().dispatchFakeMouseMoveEventSoonInQuad(quadForFakeMouseMoveEvent);
 
     bool requiresPaintInvalidation = true;
 
     if (box().view()->compositor()->inCompositingMode()) {
         bool onlyScrolledCompositedLayers = scrollsOverflow()
             && !layer()->hasVisibleNonLayerContent()
             && !layer()->hasNonCompositedChild()
@@ skipping 1044 matching lines @@
         return false;
 
     LocalFrame* frame = box().frame();
     if (!frame || !frame->isMainFrame() || !frame->settings())
         return false;
 
     return frame->settings()->viewportMetaEnabled();
 }
 
 } // namespace blink