Disable UpgradeSigninPromoTest.testStartupSigninPromoNoRestrictions

Bug: 1240313
Change-Id: I80eb28647410441e5617c5409eb0a62faead8c6b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3098432
Commit-Queue: Mike Dougherty <michaeldo@chromium.org>
Commit-Queue: Rohit Rao <rohitrao@chromium.org>
Auto-Submit: Mike Dougherty <michaeldo@chromium.org>
Reviewed-by: Rohit Rao <rohitrao@chromium.org>
Cr-Commit-Position: refs/heads/master@{#912310}

ios/chrome/browser/ui/authentication/signin/user_signin/upgrade_signin_promo_egtest.mm

@@ -73,6 +73,11 @@ - (void)setUp {
 
 // Tests that the sign-in promo is visible at start-up.
 - (void)testStartupSigninPromoNoRestrictions {
+  if (@available(iOS 15, *)) {
+    // TODO(crbug.com/1240313): Re-enable for iOS 15.
+    EARL_GREY_TEST_DISABLED(@"Disabled on iOS 15.");
+  }
+
   // Create the config to relaunch Chrome.
   AppLaunchConfiguration config = AppConfigurationForRelaunch();
   config.features_disabled.push_back(switches::kMinorModeSupport);