Oilpan: dispose an HTMLImportsController on document detach/removal.

Source/core/html/imports/HTMLImportLoader.h

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 53 matching lines @@
         StateLoaded,
         StateError
     };
 
     static PassOwnPtrWillBeRawPtr<HTMLImportLoader> create(HTMLImportsController* controller)
     {
         return adoptPtrWillBeNoop(new HTMLImportLoader(controller));
     }
 
     virtual ~HTMLImportLoader();
+    void dispose();
 
     Document* document() const { return m_document.get(); }
     void addImport(HTMLImportChild*);
-#if !ENABLE(OILPAN)
     void removeImport(HTMLImportChild*);
-#endif
+
     void moveToFirst(HTMLImportChild*);
     HTMLImportChild* firstImport() const { return m_imports[0]; }
     bool isFirstImport(const HTMLImportChild* child) const { return m_imports.size() ? firstImport() == child : false; }
 
     bool isDone() const { return m_state == StateLoaded || m_state == StateError; }
     bool hasError() const { return m_state == StateError; }
     bool shouldBlockScriptExecution() const;
 
-#if !ENABLE(OILPAN)
-    void importDestroyed();
-#endif
     void startLoading(const ResourcePtr<RawResource>&);
 
     // Tells the loader that all of the import's stylesheets finished
     // loading.
     // Called by Document::didRemoveAllPendingStylesheet.
     void didRemoveAllPendingStylesheet();
 
     PassRefPtrWillBeRawPtr<CustomElementSyncMicrotaskQueue> microtaskQueue() const;
 
     DECLARE_VIRTUAL_TRACE();
@@ skipping 27 matching lines @@
     WillBeHeapVector<RawPtrWillBeMember<HTMLImportChild>> m_imports;
     State m_state;
     RefPtrWillBeMember<Document> m_document;
     RefPtrWillBeMember<DocumentWriter> m_writer;
     RefPtrWillBeMember<CustomElementSyncMicrotaskQueue> m_microtaskQueue;
 };
 
 } // namespace blink
 
 #endif // HTMLImportLoader_h