Merge //ios/chrome/browser/signin:{authentication_service,signin}.

ios/chrome/browser/browser_state/browser_state_keyed_service_factories.mm

Index: ios/chrome/browser/browser_state/browser_state_keyed_service_factories.mm
diff --git a/ios/chrome/browser/browser_state/browser_state_keyed_service_factories.mm b/ios/chrome/browser/browser_state/browser_state_keyed_service_factories.mm
index 214d6fb38620a385802fd9a2ec8708f3536a2cb9..2339a919b8d8b48c56db397cba18683a9f54d24f 100644
--- a/ios/chrome/browser/browser_state/browser_state_keyed_service_factories.mm
+++ b/ios/chrome/browser/browser_state/browser_state_keyed_service_factories.mm
@@ -31,6 +31,7 @@
 #include "ios/chrome/browser/signin/account_fetcher_service_factory.h"
 #include "ios/chrome/browser/signin/account_reconcilor_factory.h"
 #include "ios/chrome/browser/signin/account_tracker_service_factory.h"
+#include "ios/chrome/browser/signin/authentication_service_factory.h"
 #include "ios/chrome/browser/signin/gaia_cookie_manager_service_factory.h"
 #include "ios/chrome/browser/signin/oauth2_token_service_factory.h"
 #include "ios/chrome/browser/signin/signin_client_factory.h"
@@ -76,6 +77,7 @@ void EnsureBrowserStateKeyedServiceFactoriesBuilt() {
   ios::TopSitesFactory::GetInstance();
   ios::WebDataServiceFactory::GetInstance();
   ios::WebHistoryServiceFactory::GetInstance();
+  AuthenticationServiceFactory::GetInstance();
   IOSChromeGCMProfileServiceFactory::GetInstance();
   IOSChromeLargeIconCacheFactory::GetInstance();
   IOSChromeLargeIconServiceFactory::GetInstance();