Fix non-otr profile's file manager being launched in guest mode.

chrome/browser/ui/app_list/app_list_syncable_service_factory.cc

Index: chrome/browser/ui/app_list/app_list_syncable_service_factory.cc
diff --git a/chrome/browser/ui/app_list/app_list_syncable_service_factory.cc b/chrome/browser/ui/app_list/app_list_syncable_service_factory.cc
index 616bd0cfc1801f3bd045b675e4b7ab70c68840ad..b0c89ad709a28020fe2446716f3b5da7ba80857b 100644
--- a/chrome/browser/ui/app_list/app_list_syncable_service_factory.cc
+++ b/chrome/browser/ui/app_list/app_list_syncable_service_factory.cc
@@ -51,6 +51,13 @@ void AppListSyncableServiceFactory::RegisterProfilePrefs(
 
 content::BrowserContext* AppListSyncableServiceFactory::GetBrowserContextToUse(
     content::BrowserContext* context) const {
+  // In guest session, off the record profile should be used instead of the
+  // original one, as the off the record profile is the active profile.
+  // TODO(tbarzic): Add a helper function to incognito_helpers.h that properly
+  //     handles the guest mode.
+  Profile* profile = static_cast<Profile*>(context);
+  if (profile->IsGuestSession())
+    return profile->GetOffTheRecordProfile();
   return chrome::GetBrowserContextRedirectedInIncognito(context);
 }