Refactoring: Introduce HTMLImport interface to form import tree.

Source/core/dom/Document.h

Index: Source/core/dom/Document.h
diff --git a/Source/core/dom/Document.h b/Source/core/dom/Document.h
index 1cef6ad89fbd665cfb8480b68b37e859a30f5f6b..68d7fbc578824e86d5049bbcb487b6882406c6cf 100644
--- a/Source/core/dom/Document.h
+++ b/Source/core/dom/Document.h
@@ -102,7 +102,7 @@ class HTMLDocument;
 class HTMLElement;
 class HTMLFrameOwnerElement;
 class HTMLHeadElement;
-class HTMLImportsController;
+class HTMLImport;
 class HTMLIFrameElement;
 class HTMLMapElement;
 class HTMLNameCollection;
@@ -996,8 +996,8 @@ public:
     CustomElementRegistry* registry() const { return m_registry.get(); }
     CustomElementRegistry* ensureCustomElementRegistry();
 
-    void setImports(PassRefPtr<HTMLImportsController>);
-    HTMLImportsController* imports() const { return m_imports.get(); }
+    void setImports(HTMLImport*);

[dominicc (has gone to gerrit), 2013/07/11 03:26:48]

Imports -> Import to match the number of HTMLImport? Likewise for imports() and
m_imports.

+    HTMLImport* imports() const { return m_imports; }
     bool haveImportsLoaded() const;
     void didLoadAllImports();
 
@@ -1328,7 +1328,7 @@ private:
     OwnPtr<TextAutosizer> m_textAutosizer;
 
     RefPtr<CustomElementRegistry> m_registry;
-    RefPtr<HTMLImportsController> m_imports;
+    HTMLImport* m_imports;
 
     bool m_scheduledTasksAreSuspended;