Convert some call sites to use explicit LayoutRect->FloatRect conversion.

Source/core/layout/LayoutObject.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  *           (C) 2004 Allan Sandfeld Jensen (kde@carewolf.com)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2009 Google Inc. All rights reserved.
  * Copyright (C) 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  *
  * This library is free software; you can redistribute it and/or
@@ skipping 968 matching lines @@
     for (size_t i = 1; i < n; ++i)
         result.unite(rects[i]);
     return result;
 }
 
 IntRect LayoutObject::absoluteOutlineBoundingBoxRect() const
 {
     Vector<LayoutRect> rects;
     const LayoutBoxModelObject* container = enclosingLayer()->layoutObject();
     addOutlineRects(rects, LayoutPoint(localToContainerPoint(FloatPoint(), container)));
-    return container->localToAbsoluteQuad(FloatQuad(unionRect(rects))).enclosingBoundingBox();
+    return container->localToAbsoluteQuad(FloatQuad(FloatRect(unionRect(rects)))).enclosingBoundingBox();
 }
 
 FloatRect LayoutObject::absoluteBoundingBoxRectForRange(const Range* range)
 {
     if (!range || !range->startContainer())
         return FloatRect();
 
     range->ownerDocument().updateLayout();
 
     Vector<FloatQuad> quads;
@@ skipping 2384 matching lines @@
         const blink::LayoutObject* root = object1;
         while (root->parent())
             root = root->parent();
         root->showLayoutTreeAndMark(object1, "*", object2, "-", 0);
     } else {
         fprintf(stderr, "Cannot showLayoutTree. Root is (nil)\n");
     }
 }
 
 #endif