C++11: Replace 0 with nullptr where applicable in layout code.

Source/core/layout/HitTestResult.cpp

 /*
  * Copyright (C) 2006, 2008, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies)
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 188 matching lines @@
 
 void HitTestResult::setScrollbar(Scrollbar* s)
 {
     m_scrollbar = s;
 }
 
 LocalFrame* HitTestResult::innerNodeFrame() const
 {
     if (m_innerNode)
         return m_innerNode->document().frame();
-    return 0;
+    return nullptr;
 }
 
 bool HitTestResult::isSelected() const
 {
     if (!m_innerNode)
         return false;
 
     if (LocalFrame* frame = m_innerNode->document().frame())
         return frame->selection().contains(m_hitTestLocation.point());
     return false;
@@ skipping 105 matching lines @@
 KURL HitTestResult::absoluteMediaURL() const
 {
     if (HTMLMediaElement* mediaElt = mediaElement())
         return mediaElt->currentSrc();
     return KURL();
 }
 
 HTMLMediaElement* HitTestResult::mediaElement() const
 {
     if (!m_innerNode)
-        return 0;
+        return nullptr;
 
     if (!(m_innerNode->layoutObject() && m_innerNode->layoutObject()->isMedia()))
-        return 0;
+        return nullptr;
 
     if (isHTMLMediaElement(*m_innerNode))
         return toHTMLMediaElement(m_innerNode);
-    return 0;
+    return nullptr;
 }
 
 KURL HitTestResult::absoluteLinkURL() const
 {
     if (!m_innerURLElement)
         return KURL();
     return m_innerURLElement->hrefURL();
 }
 
 bool HitTestResult::isLiveLink() const
@@ skipping 137 matching lines @@
     ASSERT(!isRectBasedTest());
 }
 
 Element* HitTestResult::innerElement() const
 {
     for (Node* node = m_innerNode.get(); node; node = ComposedTreeTraversal::parent(*node)) {
         if (node->isElementNode())
             return toElement(node);
     }
 
-    return 0;
+    return nullptr;
 }
 
 Node* HitTestResult::innerNodeOrImageMapImage() const
 {
     if (!m_innerNode)
         return nullptr;
 
     HTMLImageElement* imageMapImageElement = nullptr;
     if (isHTMLAreaElement(m_innerNode))
         imageMapImageElement = toHTMLAreaElement(m_innerNode)->imageElement();
     else if (isHTMLMapElement(m_innerNode))
         imageMapImageElement = toHTMLMapElement(m_innerNode)->imageElement();
 
     if (!imageMapImageElement)
         return m_innerNode.get();
 
     return imageMapImageElement;
 }
 
 } // namespace blink