Prevent app restore from happening on restart when user is in incognito mode.

chrome/browser/ui/startup/startup_browser_creator_impl.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/ui/startup/startup_browser_creator_impl.h"
 
 #include <algorithm>
 #include <vector>
 
 #include "base/bind.h"
@@ skipping 625 matching lines @@
   SessionStartupPref pref =
       StartupBrowserCreator::GetSessionStartupPref(command_line_, profile_);
   if (pref.type == SessionStartupPref::LAST)
     VLOG(1) << "Pref: last";
   else if (pref.type == SessionStartupPref::URLS)
     VLOG(1) << "Pref: urls";
   else if (pref.type == SessionStartupPref::DEFAULT)
     VLOG(1) << "Pref: default";
 
   // The only time apps get restored is when the browser process is restarted.
-  if (StartupBrowserCreator::WasRestarted())
-    extensions::AppRestoreServiceFactory::GetForProfile(profile_)->
-        RestoreApps();
+  if (StartupBrowserCreator::WasRestarted()) {
+    extensions::AppRestoreService* service =
+        extensions::AppRestoreServiceFactory::GetForProfile(profile_);
+    // NULL in incognito mode.
+    if (service)
+      service->RestoreApps();
+  }
 
   if (pref.type == SessionStartupPref::LAST) {
     if (profile_->GetLastSessionExitType() == Profile::EXIT_CRASHED &&
         !command_line_.HasSwitch(switches::kRestoreLastSession)) {
       // The last session crashed. It's possible automatically loading the
       // page will trigger another crash, locking the user out of chrome.
       // To avoid this, don't restore on startup but instead show the crashed
       // infobar.
       VLOG(1) << "Unclean exit; not processing";
       return false;
@@ skipping 367 matching lines @@
         // New:
         prefs->GetString(prefs::kHomePage),
         prefs->GetBoolean(prefs::kHomePageIsNewTabPage),
         prefs->GetBoolean(prefs::kShowHomeButton),
         // Backup:
         backup_homepage,
         backup_homepage_is_ntp,
         backup_show_home_button));
   }
 }