Simplify ownership handling of HTMLImportsController.

third_party/WebKit/Source/core/html/imports/HTMLImportsController.cpp

 /*
  * 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 23 matching lines @@
 #include "core/fetch/ResourceFetcher.h"
 #include "core/frame/LocalFrame.h"
 #include "core/frame/UseCounter.h"
 #include "core/html/imports/HTMLImportChild.h"
 #include "core/html/imports/HTMLImportChildClient.h"
 #include "core/html/imports/HTMLImportLoader.h"
 #include "core/html/imports/HTMLImportTreeRoot.h"
 
 namespace blink {
 
-const char* HTMLImportsController::supplementName()
-{
-    return "HTMLImportsController";
-}
-
-void HTMLImportsController::provideTo(Document& master)
-{
-    HTMLImportsController* controller = new HTMLImportsController(master);
-    master.setImportsController(controller);
-    Supplement<Document>::provideTo(master, supplementName(), controller);
-}
-
-void HTMLImportsController::removeFrom(Document& master)
-{
-    HTMLImportsController* controller = master.importsController();
-    ASSERT(controller);
-    controller->dispose();
-    static_cast<Supplementable<Document>&>(master).removeSupplement(supplementName());
-    master.setImportsController(nullptr);
-}
-
 HTMLImportsController::HTMLImportsController(Document& master)
     : m_root(HTMLImportTreeRoot::create(&master))
 {
     UseCounter::count(master, UseCounter::HTMLImports);
 }
 
-HTMLImportsController::~HTMLImportsController()
-{
-}
-
 void HTMLImportsController::dispose()
 {
     if (m_root) {
         m_root->dispose();
         m_root.clear();
     }
 
     for (size_t i = 0; i < m_loaders.size(); ++i)
         m_loaders[i]->dispose();
     m_loaders.clear();
@@ skipping 80 matching lines @@
 
 Document* HTMLImportsController::loaderDocumentAt(size_t i) const
 {
     return loaderAt(i)->document();
 }
 
 DEFINE_TRACE(HTMLImportsController)
 {
     visitor->trace(m_root);
     visitor->trace(m_loaders);
-    Supplement<Document>::trace(visitor);
 }
 
 } // namespace blink