Have TreeScrope::adoptIfNeeded() take a reference instead of a pointer

Source/core/dom/TreeScopeAdopter.h

Index: Source/core/dom/TreeScopeAdopter.h
diff --git a/Source/core/dom/TreeScopeAdopter.h b/Source/core/dom/TreeScopeAdopter.h
index a83d178482ac68bd7d6f3d0f2906163ac1abeebd..17742ba25532b0f9ad92bbb93e48828a40c9c0c3 100644
--- a/Source/core/dom/TreeScopeAdopter.h
+++ b/Source/core/dom/TreeScopeAdopter.h
@@ -33,7 +33,7 @@ class TreeScope;
 
 class TreeScopeAdopter {
 public:
-    explicit TreeScopeAdopter(Node* toAdopt, TreeScope* newScope);
+    TreeScopeAdopter(Node& toAdopt, TreeScope& newScope);
 
     void execute() const { moveTreeToNewScope(m_toAdopt); }
     bool needsScopeChange() const { return m_oldScope != m_newScope; }
@@ -45,23 +45,21 @@ public:
 #endif
 
 private:
-    void updateTreeScope(Node*) const;
-    void moveTreeToNewScope(Node*) const;
-    void moveTreeToNewDocument(Node*, Document* oldDocument, Document* newDocument) const;
-    void moveNodeToNewDocument(Node*, Document* oldDocument, Document* newDocument) const;
+    void updateTreeScope(Node&) const;
+    void moveTreeToNewScope(Node&) const;
+    void moveTreeToNewDocument(Node&, Document& oldDocument, Document* newDocument) const;
+    void moveNodeToNewDocument(Node&, Document& oldDocument, Document* newDocument) const;
 
-    Node* m_toAdopt;
-    TreeScope* m_newScope;
-    TreeScope* m_oldScope;
+    Node& m_toAdopt;
+    TreeScope& m_newScope;
+    TreeScope& m_oldScope;
 };
 
-// FIXME: Should take |TreeScope&| instead of |TreeScope*|.
-inline TreeScopeAdopter::TreeScopeAdopter(Node* toAdopt, TreeScope* newScope)
+inline TreeScopeAdopter::TreeScopeAdopter(Node& toAdopt, TreeScope& newScope)
     : m_toAdopt(toAdopt)
     , m_newScope(newScope)
-    , m_oldScope(&toAdopt->treeScope())
+    , m_oldScope(toAdopt.treeScope())
 {
-    ASSERT(newScope);
 }
 
 }