[ios] Disables OmniboxPopupTestCase.testCloseNTPWhenSwitching.

This test fails on smaller form factors because the test is looking for
results that are no longer visible on screen after ranking changes
bumped them down in the results list.

BUG=1025199

Change-Id: I02d799a94c1cc5f72f85f5f6ba588542232f9bee
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1918950
Auto-Submit: Rohit Rao <rohitrao@chromium.org>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Commit-Queue: Rohit Rao <rohitrao@chromium.org>
Cr-Commit-Position: refs/heads/master@{#715765}

ios/chrome/browser/ui/omnibox/popup/omnibox_popup_egtest.mm

@@ -230,7 +230,9 @@ std::unique_ptr<net::test_server::HttpResponse> StandardResponse(
       assertWithMatcher:grey_nil()];
 }
 
-- (void)testCloseNTPWhenSwitching {
+// TODO(crbug.com/1025199): On smaller form factors, the desired "Switch
+// to tab" row does not fit above the fold, so this test fails.
+- (void)DISABLED_testCloseNTPWhenSwitching {
   // Open the first page.
   GURL URL1 = self.testServer->GetURL(kPage1URL);
   [ChromeEarlGrey loadURL:URL1];