Make the constructor of a LayoutRect from an IntRect explicit.

Source/core/layout/LayoutBox.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2005 Allan Sandfeld Jensen (kde@carewolf.com)
  *           (C) 2005, 2006 Samuel Weinig (sam.weinig@gmail.com)
  * Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2013 Adobe Systems Incorporated. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ skipping 481 matching lines @@
         // Don't scroll to reveal an overflow layer that is restricted by the -webkit-line-clamp property.
         // This will prevent us from revealing text hidden by the slider in Safari RSS.
         newRect = layer()->scrollableArea()->exposeRect(rect, alignX, alignY);
     } else if (!parentBox && canBeProgramaticallyScrolled()) {
         if (FrameView* frameView = this->frameView()) {
             HTMLFrameOwnerElement* ownerElement = document().ownerElement();
 
             if (ownerElement && ownerElement->renderer()) {
                 HTMLFrameElementBase* frameElementBase = isHTMLFrameElementBase(*ownerElement) ? toHTMLFrameElementBase(ownerElement) : 0;
                 if (frameElementAndViewPermitScroll(frameElementBase, frameView)) {
-                    LayoutRect viewRect = frameView->visibleContentRect();
+                    LayoutRect viewRect(frameView->visibleContentRect());
                     LayoutRect exposeRect = ScrollAlignment::getRectToExpose(viewRect, rect, alignX, alignY);
 
                     double xOffset = exposeRect.x();
                     double yOffset = exposeRect.y();
                     // Adjust offsets if they're outside of the allowable range.
                     xOffset = std::max(0.0, std::min<double>(frameView->contentsWidth(), xOffset));
                     yOffset = std::max(0.0, std::min<double>(frameView->contentsHeight(), yOffset));
 
                     frameView->setScrollPosition(DoublePoint(xOffset, yOffset));
                     if (frameView->safeToPropagateScrollToParent()) {
@@ skipping 650 matching lines @@
 
 void LayoutBox::paintBoxDecorationBackground(const PaintInfo& paintInfo, const LayoutPoint& paintOffset)
 {
     BoxPainter(*this).paintBoxDecorationBackground(paintInfo, paintOffset);
 }
 
 
 bool LayoutBox::getBackgroundPaintedExtent(LayoutRect& paintedExtent)
 {
     ASSERT(hasBackground());
-    LayoutRect backgroundRect = enclosingIntRect(borderBoxRect());
+    LayoutRect backgroundRect(enclosingIntRect(borderBoxRect()));
 
     Color backgroundColor = resolveColor(CSSPropertyBackgroundColor);
     if (backgroundColor.alpha()) {
         paintedExtent = backgroundRect;
         return true;
     }
 
     if (!style()->backgroundLayers().image() || style()->backgroundLayers().next()) {
         paintedExtent =  backgroundRect;
         return true;
@@ skipping 3443 matching lines @@
 }
 
 void LayoutBox::invalidateDisplayItemClients(DisplayItemList* displayItemList) const
 {
     LayoutBoxModelObject::invalidateDisplayItemClients(displayItemList);
     if (LayerScrollableArea* area = scrollableArea())
         displayItemList->invalidate(area->displayItemClient());
 }
 
 } // namespace blink