Disable testSignInOpenSettings and testSignInAndTapSettingsLink on iOS.

ios/chrome/browser/ui/first_run/first_run_egtest.mm

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #import <EarlGrey/EarlGrey.h>
 #import <XCTest/XCTest.h>
 
 #include "base/strings/sys_string_conversions.h"
 #include "components/metrics/metrics_pref_names.h"
 #include "components/metrics/metrics_reporting_default_state.h"
@@ skipping 198 matching lines @@
   [[EarlGrey selectElementWithMatcher:UndoAccountConsistencyButton()]
       performAction:grey_tap()];
   [[EarlGrey selectElementWithMatcher:FirstRunAccountConsistencySkipButton()]
       performAction:grey_tap()];
 
   // |identity| shouldn't be signed in.
   AssertAuthenticatedIdentityInActiveProfile(nil);
 }
 
 // Signs in to an account and then taps the Advanced link to go to settings.
-- (void)testSignInAndTapSettingsLink {
+// TODO(crbug.com/718023): Re-enable test.
+- (void)testSignInAndTapSettingsLink_DISABLED {
   ChromeIdentity* identity = GetFakeIdentity();
   ios::FakeChromeIdentityService::GetInstanceFromChromeProvider()->AddIdentity(
       identity);
 
   // Launch First Run and accept tems of services.
   [chrome_test_util::GetMainController() showFirstRunUI];
   [[EarlGrey selectElementWithMatcher:FirstRunOptInAcceptButton()]
       performAction:grey_tap()];
 
   // Sign In |identity|.
@@ skipping 15 matching lines @@
 
   // Close Settings, user is still signed in and sync is now starting.
   [[EarlGrey selectElementWithMatcher:NavigationBarDoneButton()]
       performAction:grey_tap()];
   AssertAuthenticatedIdentityInActiveProfile(identity);
   GREYAssertTrue(sync_service->HasFinishedInitialSetup(),
                  @"Sync should have finished its original setup");
 }
 
 @end