[iOS] Disable failing omnibox test

OmniboxPopupTestCase.testIncognitoSeparation crashes constantly on
devices.

TBR=stkhapugin@chromium.org

Bug: 1045950
Change-Id: Ie6ccd8308d39e53d1ea66da1269fd5b1e8282f4a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2020781
Commit-Queue: Javier Ernesto Flores Robles <javierrobles@chromium.org>
Reviewed-by: Javier Ernesto Flores Robles <javierrobles@chromium.org>
Cr-Commit-Position: refs/heads/master@{#735426}

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

@@ -164,7 +164,13 @@ std::unique_ptr<net::test_server::HttpResponse> StandardResponse(
 
 // Tests that the incognito tabs aren't displayed as "opened" tab in the
 // non-incognito suggestions and vice-versa.
-- (void)testIncognitoSeparation {
+// TODO(crbug.com/1045950): fix and reenable on devices.
+#if !TARGET_IPHONE_SIMULATOR
+#define MAYBE_testIncognitoSeparation DISABLED_testIncognitoSeparation
+#else
+#define MAYBE_testIncognitoSeparation testIncognitoSeparation
+#endif
+- (void)MAYBE_testIncognitoSeparation {
   GURL URL1 = self.testServer->GetURL(kPage1URL);
   GURL URL2 = self.testServer->GetURL(kPage2URL);
   GURL URL3 = self.testServer->GetURL(kPage3URL);