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

chrome/browser/extensions/state_store.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/state_store.h"
 
 #include "base/bind.h"
 #include "base/message_loop.h"
 #include "chrome/common/chrome_notification_types.h"
 #include "chrome/common/extensions/extension.h"
@@ skipping 111 matching lines @@
   task_queue_->InvokeWhenReady(
       base::Bind(&ValueStoreFrontend::Remove, base::Unretained(&store_),
                  GetFullKey(extension_id, key)));
 }
 
 void StateStore::Observe(int type,
                          const content::NotificationSource& source,
                          const content::NotificationDetails& details) {
   switch (type) {
     case chrome::NOTIFICATION_EXTENSION_INSTALLED:
+      RemoveKeysForExtension(
+          content::Details<const InstalledExtensionInfo>(details)->extension->
+              id());
+      break;
     case chrome::NOTIFICATION_EXTENSION_UNINSTALLED:
       RemoveKeysForExtension(
-          content::Details<const Extension>(details).ptr()->id());
+          content::Details<const Extension>(details)->id());
       break;
     case chrome::NOTIFICATION_SESSION_RESTORE_DONE:
     case content::NOTIFICATION_LOAD_COMPLETED_MAIN_FRAME:
       registrar_.Remove(this, content::NOTIFICATION_LOAD_COMPLETED_MAIN_FRAME,
                         content::NotificationService::AllSources());
       registrar_.Remove(this, chrome::NOTIFICATION_SESSION_RESTORE_DONE,
                         content::NotificationService::AllSources());
       MessageLoop::current()->PostDelayedTask(FROM_HERE,
           base::Bind(&StateStore::Init, AsWeakPtr()),
           base::TimeDelta::FromSeconds(kInitDelaySeconds));
@@ skipping 13 matching lines @@
 void StateStore::RemoveKeysForExtension(const std::string& extension_id) {
   for (std::set<std::string>::iterator key = registered_keys_.begin();
        key != registered_keys_.end(); ++key) {
     task_queue_->InvokeWhenReady(
         base::Bind(&ValueStoreFrontend::Remove, base::Unretained(&store_),
                    GetFullKey(extension_id, *key)));
   }
 }
 
 }  // namespace extensions