Convert ExtensionRegistry to a BrowserContextKeyedService

extensions/browser/extension_registry_factory.h

+// Copyright 2013 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 EXTENSIONS_BROWSER_EXTENSION_REGISTRY_FACTORY_H_
+#define EXTENSIONS_BROWSER_EXTENSION_REGISTRY_FACTORY_H_
+
+#include "base/compiler_specific.h"
+#include "base/memory/singleton.h"
+#include "components/browser_context_keyed_service/browser_context_keyed_service_factory.h"
+
+namespace extensions {
+
+class ExtensionRegistry;
+
+// Factory for ExtensionRegistry objects. ExtensionRegistry objects are shared
+// between an incognito browser context and its master browser context.
+class ExtensionRegistryFactory : public BrowserContextKeyedServiceFactory {
+ public:
+  static ExtensionRegistry* GetForBrowserContext(
+      content::BrowserContext* context);
+
+  static ExtensionRegistryFactory* GetInstance();
+
+ private:
+  friend struct DefaultSingletonTraits<ExtensionRegistryFactory>;
+
+  ExtensionRegistryFactory();
+  virtual ~ExtensionRegistryFactory();
+
+  // BrowserContextKeyedServiceFactory implementation:
+  virtual BrowserContextKeyedService* BuildServiceInstanceFor(
+      content::BrowserContext* profile) const OVERRIDE;
+  virtual content::BrowserContext* GetBrowserContextToUse(
+      content::BrowserContext* context) const OVERRIDE;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(ExtensionRegistryFactory);
+};
+
+}  // namespace extensions
+
+#endif  // EXTENSIONS_BROWSER_EXTENSION_REGISTRY_FACTORY_H_