Made it possible to tell whether an extension is being installed or updated.

chrome/browser/extensions/api/commands/command_service.cc

 // Copyright (c) 2012 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.
 
 #include "chrome/browser/extensions/api/commands/command_service.h"
 
 #include "base/lazy_instance.h"
 #include "base/string_util.h"
 #include "base/utf_string_conversions.h"
 #include "chrome/browser/extensions/api/commands/commands.h"
@@ skipping 156 matching lines @@
   return true;
 }
 
 void CommandService::Observe(
     int type,
     const content::NotificationSource& source,
     const content::NotificationDetails& details) {
   switch (type) {
     case chrome::NOTIFICATION_EXTENSION_INSTALLED:
       AssignInitialKeybindings(
-          content::Details<const Extension>(details).ptr());
+          content::Details<const InstalledExtensionInfo>(details)->extension);
       break;
     case chrome::NOTIFICATION_EXTENSION_UNINSTALLED:
       RemoveKeybindingPrefs(
-          content::Details<const Extension>(details).ptr()->id(),
+          content::Details<const Extension>(details)->id(),
           std::string());
       break;
     default:
       NOTREACHED();
       break;
   }
 }
 
 void CommandService::UpdateKeybindingPrefs(const std::string& extension_id,
                                            const std::string& command_name,
@@ skipping 174 matching lines @@
     return false;
 
   *command = *requested_command;
   if (shortcut_assigned.key_code() != ui::VKEY_UNKNOWN)
     command->set_accelerator(shortcut_assigned);
 
   return true;
 }
 
 }  // namespace extensions