Add NULL check to AppRestoreService

chrome/browser/extensions/app_restore_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/app_restore_service.h"
 
 #include "chrome/browser/extensions/api/app_runtime/app_runtime_api.h"
 #include "chrome/browser/extensions/event_router.h"
 #include "chrome/browser/extensions/extension_host.h"
 #include "chrome/browser/extensions/extension_service.h"
@@ skipping 40 matching lines @@
   }
 }
 
 void AppRestoreService::Observe(int type,
                                 const content::NotificationSource& source,
                                 const content::NotificationDetails& details) {
   switch (type) {
     case chrome::NOTIFICATION_EXTENSION_HOST_DID_STOP_LOADING: {
       ExtensionHost* host = content::Details<ExtensionHost>(details).ptr();
       const Extension* extension = host->extension();
-      if (extension && extension->is_platform_app()) {
+      if (extension && extension->is_platform_app())
         RecordAppStart(extension->id());
-      }
       break;
     }
 
     case chrome::NOTIFICATION_EXTENSION_HOST_DESTROYED: {
       ExtensionHost* host = content::Details<ExtensionHost>(details).ptr();
-      if (host->extension()->is_platform_app()) {
-        RecordAppStop(host->extension()->id());
-      }
+      const Extension* extension = host->extension();
+      if (extension && extension->is_platform_app())
+        RecordAppStop(extension->id());
       break;
     }
 
     case chrome::NOTIFICATION_APP_TERMINATING: {
       // Stop listening to NOTIFICATION_EXTENSION_HOST_DESTROYED in particular
       // as all extension hosts will be destroyed as a result of shutdown.
       registrar_.RemoveAll();
       break;
     }
   }
@@ skipping 10 matching lines @@
   ExtensionPrefs* extension_prefs =
       ExtensionSystem::Get(profile_)->extension_service()->extension_prefs();
   extension_prefs->SetExtensionRunning(extension_id, false);
 }
 
 void AppRestoreService::RestoreApp(const Extension* extension) {
   AppEventRouter::DispatchOnRestartedEvent(profile_, extension);
 }
 
 }  // namespace extensions