ios: Disable OmniboxTestCase/testXClientData.

NOTRY=true

Bug: 1121305
Change-Id: I6dc5444a949cf4d71a0d611612f9a950b580fe18
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2373013
Commit-Queue: Justin Cohen <justincohen@chromium.org>
Commit-Queue: Sergio Collazos <sczs@chromium.org>
Auto-Submit: Justin Cohen <justincohen@chromium.org>
Reviewed-by: Sergio Collazos <sczs@chromium.org>
Cr-Commit-Position: refs/heads/master@{#801118}

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

@@ -164,6 +164,10 @@ id<GREYMatcher> SearchCopiedTextButton() {
   }
 #endif
 
+  // TODO(crbug.com/1121305): Test is failing due to clearing the variations on
+  // first run, causing tests to fail flakily on the bots.
+  EARL_GREY_TEST_SKIPPED(@"testXClientData fails on first simulator run.");
+
   // TODO(crbug.com/1120723) This test is flakily because of a DCHECK in
   // ios/web.  Clearing browser history first works around the problem, but
   // shouldn't be necessary otherwise.  Remove once the bug is fixed.