Make possible restarting extensions from the chrome://extensions/ page....

chrome/browser/extensions/extensions_service.h

 // Copyright (c) 2009 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_EXTENSIONS_SERVICE_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTENSIONS_SERVICE_H_
 
 #include <map>
 #include <set>
 #include <string>
@@ skipping 135 matching lines @@
   // |extension_path|. The |alert_on_error| parameter controls whether the
   // user will be notified in the event of failure. If |callback| is non-null,
   // it will be called back when the update is finished (in success or failure).
   // This is useful to know when the service is done using |extension_path|.
   // Also, this takes ownership of |callback| if it's non-null.
   virtual void UpdateExtension(const std::string& id,
                                const FilePath& extension_path,
                                bool alert_on_error,
                                ExtensionInstallCallback* callback);
 
+  // Reloads the specified extension.
+  void ReloadExtension(const std::string& extension_id);
+
   // Uninstalls the specified extension. Callers should only call this method
   // with extensions that exist. |external_uninstall| is a magical parameter
   // that is only used to send information to ExtensionPrefs, which external
   // callers should never set to true.
   // TODO(aa): Remove |external_uninstall| -- this information should be passed
   // to ExtensionPrefs some other way.
   void UninstallExtension(const std::string& extension_id,
                           bool external_uninstall);
 
   // Load the extension from the directory |extension_path|.
@@ skipping 343 matching lines @@
 
   // A map of all external extension providers.
   typedef std::map<Extension::Location,
                    linked_ptr<ExternalExtensionProvider> > ProviderMap;
   ProviderMap external_extension_providers_;
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionsServiceBackend);
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSIONS_SERVICE_H_