Have Node::diff() take a Document reference in argument

Source/core/dom/Node.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ skipping 246 matching lines @@
     printf("  Number of Attributes (non-Node and Node): %zu [%zu]\n", attributes, sizeof(Attribute));
     printf("  Number of Attributes with an Attr: %zu\n", attributesWithAttr);
     printf("  Number of Elements with attribute storage: %zu [%zu]\n", elementsWithAttributeStorage, sizeof(ElementData));
     printf("  Number of Elements with RareData: %zu\n", elementsWithRareData);
     printf("  Number of Elements with NamedNodeMap: %zu [%zu]\n", elementsWithNamedNodeMap, sizeof(NamedNodeMap));
 #endif
 }
 
 DEFINE_DEBUG_ONLY_GLOBAL(WTF::RefCountedLeakCounter, nodeCounter, ("WebCoreNode"));
 
-Node::StyleChange Node::diff(const RenderStyle* s1, const RenderStyle* s2, Document* doc)
+Node::StyleChange Node::diff(const RenderStyle* s1, const RenderStyle* s2, const Document& doc)
 {
     StyleChange ch = NoInherit;
     EDisplay display1 = s1 ? s1->display() : NONE;
     bool fl1 = s1 && s1->hasPseudoStyle(FIRST_LETTER);
     EDisplay display2 = s2 ? s2->display() : NONE;
     bool fl2 = s2 && s2->hasPseudoStyle(FIRST_LETTER);
 
     // We just detach if a renderer acquires or loses a column-span, since spanning elements
     // typically won't contain much content.
     bool colSpan1 = s1 && s1->columnSpan();
     bool colSpan2 = s2 && s2->columnSpan();
 
     bool specifiesColumns1 = s1 && (!s1->hasAutoColumnCount() || !s1->hasAutoColumnWidth());
     bool specifiesColumns2 = s2 && (!s2->hasAutoColumnCount() || !s2->hasAutoColumnWidth());
 
     if (display1 != display2 || fl1 != fl2 || colSpan1 != colSpan2
-        || (specifiesColumns1 != specifiesColumns2 && doc->settings()->regionBasedColumnsEnabled())
+        || (specifiesColumns1 != specifiesColumns2 && doc.settings()->regionBasedColumnsEnabled())
         || (s1 && s2 && !s1->contentDataEquivalent(s2)))
         ch = Reattach;
     else if (!s1 || !s2)
         ch = Inherit;
     else if (*s1 == *s2)
         ch = NoChange;
     else if (s1->inheritedNotEqual(s2))
         ch = Inherit;
     else if (s1->hasExplicitlyInheritedProperties() || s2->hasExplicitlyInheritedProperties())
         ch = Inherit;
@@ skipping 2470 matching lines @@
         node->showTreeForThis();
 }
 
 void showNodePath(const WebCore::Node* node)
 {
     if (node)
         node->showNodePathForThis();
 }
 
 #endif