Add TriggerOnUninstalled to ExtensionRegistry

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"
@@ skipping 64 matching lines @@
                          UnloadedExtensionInfo::Reason reason);
 
   // If this is a fresh install then |is_update| is false and there must not be
   // any installed extension with |extension|'s ID. If this is an update then
   // |is_update| is true and must be an installed extension with |extension|'s
   // ID, and |old_name| must be non-empty.
   void TriggerOnWillBeInstalled(const Extension* extension,
                                 bool is_update,
                                 const std::string& old_name);
 
+  // Invokes the observer method OnExtensionUninstalled(). The extension must
+  // not be any installed extension with |extension|'s ID.
+  void TriggerOnUninstalled(const Extension* extension);
+
   // Find an extension by ID using |include_mask| to pick the sets to search:
   //  * enabled_extensions()     --> ExtensionRegistry::ENABLED
   //  * disabled_extensions()    --> ExtensionRegistry::DISABLED
   //  * terminated_extensions()  --> ExtensionRegistry::TERMINATED
   //  * blacklisted_extensions() --> ExtensionRegistry::BLACKLISTED
   // Returns NULL if the extension is not found in the selected sets.
   const Extension* GetExtensionById(const std::string& id,
                                     int include_mask) const;
 
   // Adds the specified extension to the enabled set. The registry becomes an
@@ skipping 52 matching lines @@
   ObserverList<ExtensionRegistryObserver> observers_;
 
   content::BrowserContext* const browser_context_;
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionRegistry);
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_BROWSER_EXTENSION_REGISTRY_H_