Don't disable easy unlock app on keyed service shutdown

For signin profile, disable it on user login.

BUG=458660

Review URL: https://codereview.chromium.org/924113003

Cr-Commit-Position: refs/heads/master@{#316349}

chrome/browser/signin/easy_unlock_service.cc

@@ -522,8 +522,6 @@ void  EasyUnlockService::Shutdown() {
 
   ShutdownInternal();
 
-  app_manager_->DisableAppIfLoaded();
-
   ResetScreenlockState();
   bluetooth_detector_.reset();
 #if defined(OS_CHROMEOS)

chrome/browser/signin/easy_unlock_service_signin_chromeos.cc

@@ -261,6 +261,8 @@ void EasyUnlockServiceSignin::OnScreenDidUnlock(
   if (screen_type != ScreenlockBridge::LockHandler::SIGNIN_SCREEN)
     return;
 
+  DisableAppWithoutResettingScreenlockState();
+
   Shutdown();
 }