Put back sign in / sign out / new user handling in the App Launcher.

chrome/browser/ui/app_list/test/chrome_app_list_test_support.cc

Index: chrome/browser/ui/app_list/test/chrome_app_list_test_support.cc
diff --git a/chrome/browser/ui/app_list/test/chrome_app_list_test_support.cc b/chrome/browser/ui/app_list/test/chrome_app_list_test_support.cc
index 95157f2b166868bd2ba4e0b4a0d63cf113e38812..34f6f83d621872edbab5abf39c377bb7a58dea7b 100644
--- a/chrome/browser/ui/app_list/test/chrome_app_list_test_support.cc
+++ b/chrome/browser/ui/app_list/test/chrome_app_list_test_support.cc
@@ -4,11 +4,9 @@
 
 #include "chrome/browser/ui/app_list/test/chrome_app_list_test_support.h"
 
-#include "chrome/browser/signin/signin_manager_factory.h"
 #include "chrome/browser/ui/app_list/app_list_service.h"
 #include "chrome/browser/ui/app_list/app_list_syncable_service.h"
 #include "chrome/browser/ui/app_list/app_list_syncable_service_factory.h"
-#include "components/signin/core/browser/signin_manager.h"
 
 namespace test {
 
@@ -22,9 +20,4 @@ AppListService* GetAppListService() {
   return AppListService::Get(chrome::GetActiveDesktop());
 }
 
-void SigninProfile(Profile* profile) {
-  SigninManagerFactory::GetForProfile(profile)->
-      SetAuthenticatedUsername("user@example.com");
-}
-
 }  // namespace test