Convert ExtensionRegistry to a BrowserContextKeyedService

extensions/browser/extension_registry.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_H_
 #define EXTENSIONS_BROWSER_EXTENSION_REGISTRY_H_
 
 #include <string>
 
+#include "base/compiler_specific.h"
 #include "base/memory/ref_counted.h"
+#include "components/browser_context_keyed_service/browser_context_keyed_service.h"
 #include "extensions/common/extension_set.h"
 
+namespace content {
+class BrowserContext;
+}
+
 namespace extensions {
 class Extension;
 
 // ExtensionRegistry holds sets of the installed extensions for a given
-// BrowserContext.
-// TODO(jamescook): Convert this to a BrowserContextKeyedService.
-class ExtensionRegistry {
+// BrowserContext. An incognito browser context and its master browser context
+// share a single registry.
+class ExtensionRegistry : public BrowserContextKeyedService {
  public:
   ExtensionRegistry();
-  ~ExtensionRegistry();
+  virtual ~ExtensionRegistry();
+
+  // Returns the instance for the given |browser_context|.
+  static ExtensionRegistry* Get(content::BrowserContext* browser_context);
 
   // NOTE: These sets are *eventually* mututally exclusive, but an extension can
   // appear in two sets for short periods of time.
   const ExtensionSet& enabled_extensions() const {
     return enabled_extensions_;
   }
   const ExtensionSet& disabled_extensions() const {
     return disabled_extensions_;
   }
   const ExtensionSet& terminated_extensions() const {
@@ skipping 30 matching lines @@
 
   // Removes all extensions from all sets.
   void ClearAll();
 
   // Sets a callback to run when the disabled extension set is modified.
   // TODO(jamescook): This is too specific for a generic registry; find some
   // other way to do this.
   void SetDisabledModificationCallback(
       const ExtensionSet::ModificationCallback& callback);
 
+  // BrowserContextKeyedService implementation:
+  virtual void Shutdown() OVERRIDE;
+
  private:
   // Extensions that are installed, enabled and not terminated.
   ExtensionSet enabled_extensions_;
 
   // Extensions that are installed and disabled.
   ExtensionSet disabled_extensions_;
 
   // Extensions that are installed and terminated.
   ExtensionSet terminated_extensions_;
 
   // Extensions that are installed and blacklisted. Generally these shouldn't be
   // considered as installed by the extension platform: we only keep them around
   // so that if extensions are blacklisted by mistake they can easily be
   // un-blacklisted.
   ExtensionSet blacklisted_extensions_;
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionRegistry);
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_BROWSER_EXTENSION_REGISTRY_H_