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

chrome/browser/ui/startup/startup_browser_creator_impl.cc

Index: chrome/browser/ui/startup/startup_browser_creator_impl.cc
diff --git a/chrome/browser/ui/startup/startup_browser_creator_impl.cc b/chrome/browser/ui/startup/startup_browser_creator_impl.cc
index 9e7aace570ea6f16b5ef738c7a542261564ec857..7434d9c7fff09403842d49496424ac332178f970 100644
--- a/chrome/browser/ui/startup/startup_browser_creator_impl.cc
+++ b/chrome/browser/ui/startup/startup_browser_creator_impl.cc
@@ -643,9 +643,13 @@ bool StartupBrowserCreatorImpl::ProcessStartupURLs(
     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 &&