Simplify SharedWorkerRepository code (Chromium side)

content/renderer/websharedworkerrepository_impl.h

-// Copyright (c) 2012 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#ifndef CONTENT_RENDERER_WEBSHAREDWORKERREPOSITORY_IMPL_H_
-#define CONTENT_RENDERER_WEBSHAREDWORKERREPOSITORY_IMPL_H_
-
-#include "base/containers/hash_tables.h"
-#include "third_party/WebKit/public/web/WebSharedWorkerRepository.h"
-
-namespace WebKit {
-class WebSharedWorker;
-}
-
-namespace content {
-
-class WebSharedWorkerRepositoryImpl : public WebKit::WebSharedWorkerRepository {
- public:
-  WebSharedWorkerRepositoryImpl();
-  virtual ~WebSharedWorkerRepositoryImpl();
-
-  virtual void addSharedWorker(WebKit::WebSharedWorker*, DocumentID document);
-  virtual void documentDetached(DocumentID document);
-
-  // Returns true if the document has created a SharedWorker (used by the
-  // WebKit code to determine if the document can be suspended).
-  virtual bool hasSharedWorkers(DocumentID document);
-
- private:
-  // The set of documents that have created a SharedWorker.
-  typedef base::hash_set<DocumentID> DocumentSet;
-  DocumentSet shared_worker_parents_;
-};
-
-}  // namespace content
-
-#endif  // CONTENT_RENDERER_WEBSHAREDWORKERREPOSITORY_IMPL_H_