Split Blacklist from ExtensionSystem.

chrome/browser/extensions/blacklist_factory.h

+// Copyright 2014 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 CHROME_BROWSER_EXTENSIONS_BLACKLIST_FACTORY_H_
+#define CHROME_BROWSER_EXTENSIONS_BLACKLIST_FACTORY_H_
+
+#include "base/memory/singleton.h"
+#include "components/keyed_service/content/browser_context_keyed_service_factory.h"
+
+namespace extensions {
+
+class Blacklist;
+
+class BlacklistFactory : public BrowserContextKeyedServiceFactory {
+ public:
+  static Blacklist* GetForBrowserContext(content::BrowserContext* context);
+  static BlacklistFactory* GetInstance();
+
+ private:
+  friend struct DefaultSingletonTraits<BlacklistFactory>;
+
+  BlacklistFactory();
+  virtual ~BlacklistFactory();
+
+  // BrowserContextKeyedServiceFactory
+  virtual KeyedService* BuildServiceInstanceFor(
+      content::BrowserContext* context) const override;
+  virtual content::BrowserContext* GetBrowserContextToUse(
+      content::BrowserContext* context) const override;
+
+  DISALLOW_COPY_AND_ASSIGN(BlacklistFactory);
+};
+
+}  // namespace extensions
+
+#endif  // CHROME_BROWSER_EXTENSIONS_BLACKLIST_FACTORY_H_