Have StyleSheetCollections constructor take a Document reference in argument

Source/core/dom/StyleSheetCollection.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
@@ skipping 21 matching lines @@
 #include "core/css/StyleSheetContents.h"
 #include "core/css/resolver/StyleResolver.h"
 #include "core/dom/Document.h"
 #include "core/dom/Element.h"
 #include "core/dom/StyleSheetCollections.h"
 #include "core/html/HTMLStyleElement.h"
 #include "core/page/Settings.h"
 
 namespace WebCore {
 
-StyleSheetCollection::StyleSheetCollection(TreeScope* treeScope)
+StyleSheetCollection::StyleSheetCollection(TreeScope& treeScope)
     : m_treeScope(treeScope)
     , m_hadActiveLoadingStylesheet(false)
 {
 }
 
 void StyleSheetCollection::addStyleSheetCandidateNode(Node* node, bool createdByParser)
 {
     if (!node->inDocument())
         return;
 
@@ skipping 100 matching lines @@
 {
     // FIXME: If many web developers use style scoped, implement reset RuleSets in per-scoping node manner.
     if (DocumentOrderedList* styleScopedScopingNodes = scopingNodesForStyleScoped()) {
         for (DocumentOrderedList::iterator it = styleScopedScopingNodes->begin(); it != styleScopedScopingNodes->end(); ++it)
             styleResolver->resetAuthorStyle(toContainerNode(*it));
     }
     if (ListHashSet<Node*, 4>* removedNodes = scopingNodesRemoved()) {
         for (ListHashSet<Node*, 4>::iterator it = removedNodes->begin(); it != removedNodes->end(); ++it)
             styleResolver->resetAuthorStyle(toContainerNode(*it));
     }
-    styleResolver->resetAuthorStyle(toContainerNode(m_treeScope->rootNode()));
+    styleResolver->resetAuthorStyle(toContainerNode(m_treeScope.rootNode()));
 }
 
 static bool styleSheetsUseRemUnits(const Vector<RefPtr<CSSStyleSheet> >& sheets)
 {
     for (unsigned i = 0; i < sheets.size(); ++i) {
         if (sheets[i]->contents()->usesRemUnits())
             return true;
     }
     return false;
 }
 
 void StyleSheetCollection::updateUsesRemUnits()
 {
     m_usesRemUnits = styleSheetsUseRemUnits(m_activeAuthorStyleSheets);
 }
 
 }