HTMLImportsController does not need to hold Document ptr.

Source/core/html/imports/HTMLImportsController.h

Index: Source/core/html/imports/HTMLImportsController.h
diff --git a/Source/core/html/imports/HTMLImportsController.h b/Source/core/html/imports/HTMLImportsController.h
index 9b9596d417e82b8b3da7a16bf40183b8e5a8cfaf..e4ee23de7b17725f58d4963afe5e975b1da7655d 100644
--- a/Source/core/html/imports/HTMLImportsController.h
+++ b/Source/core/html/imports/HTMLImportsController.h
@@ -61,17 +61,13 @@ public:
 
     HTMLImportTreeRoot* root() const { return m_root.get(); }
 
-    bool isMaster(const Document& document) const { return m_master == &document; }
     bool shouldBlockScriptExecution(const Document&) const;
     void wasDetachedFrom(const Document&);
 
     HTMLImportChild* load(HTMLImport* parent, HTMLImportChildClient*, FetchRequest);
     void showSecurityErrorMessage(const String&);
 
-    SecurityOrigin* securityOrigin() const;
-    ResourceFetcher* fetcher() const;
-    LocalFrame* frame() const;
-    Document* master() const { return m_master; }
+    Document* master() const;
 
     HTMLImportLoader* createLoader();
 
@@ -83,8 +79,6 @@ private:
     HTMLImportChild* createChild(const KURL&, HTMLImportLoader*, HTMLImport* parent, HTMLImportChildClient*);
     void clear();
 
-    Document* m_master;
-
     OwnPtr<HTMLImportTreeRoot> m_root;
 
     typedef Vector<OwnPtr<HTMLImportLoader> > LoaderList;