[iOS] Disable testFocusingOmniboxDismissesEditMenu for iOS 12 devices

LocationBarSteadyStateTestCase/testFocusingOmniboxDismissesEditMenu

Bug: 1129095
Change-Id: I7d9f7676530c3f657cc31e1be7e9b3937718297c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2414566
Auto-Submit: Mike Dougherty <michaeldo@chromium.org>
Commit-Queue: Justin Cohen <justincohen@chromium.org>
Reviewed-by: Justin Cohen <justincohen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#808010}

ios/chrome/browser/ui/omnibox/omnibox_egtest.mm

@@ -305,6 +305,13 @@ id<GREYMatcher> SearchCopiedTextButton() {
 }
 
 - (void)testFocusingOmniboxDismissesEditMenu {
+// TODO(crbug.com/1129095): Re-enable test for iOS 12 device.
+#if !TARGET_IPHONE_SIMULATOR
+  if (!base::ios::IsRunningOnIOS13OrLater()) {
+    EARL_GREY_TEST_DISABLED(@"Fails on iOS 12 devices.");
+  }
+#endif
+
   [self openPage1];
 
   // Long pressing should open edit menu.