ios: Disable failing GaiaAuthFetcher tests on iOS12.

Bug: 1106030
Change-Id: I7a422c99de9f3de5b613e38625260c93927adb36
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2299533
Commit-Queue: Justin Cohen <justincohen@chromium.org>
Commit-Queue: Rohit Rao <rohitrao@chromium.org>
Auto-Submit: Justin Cohen <justincohen@chromium.org>
Reviewed-by: Rohit Rao <rohitrao@chromium.org>
Cr-Commit-Position: refs/heads/master@{#788769}

ios/chrome/browser/signin/gaia_auth_fetcher_ios_ns_url_session_bridge_unittests.mm

@@ -8,6 +8,7 @@
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
+#include "base/ios/ios_util.h"
 #include "base/strings/sys_string_conversions.h"
 #include "base/test/bind_test_util.h"
 #import "base/test/ios/wait_util.h"
@@ -403,6 +404,11 @@ TEST_F(GaiaAuthFetcherIOSNSURLSessionBridgeTest,
     return;
   }
 
+  // TODO(crbug.com/1106030): expected_cookies_set is failing on iOS12.
+  if (!base::ios::IsRunningOnIOS13OrLater()) {
+    return;
+  }
+
   OCMExpect([http_cookie_storage_mock_
       storeCookies:@[]
            forTask:url_session_data_task_mock_]);
@@ -436,6 +442,11 @@ TEST_F(GaiaAuthFetcherIOSNSURLSessionBridgeTest, MAYBE_FetchWithCookieStore) {
     return;
   }
 
+  // TODO(crbug.com/1106030): expected_cookies_set is failing on iOS12.
+  if (!base::ios::IsRunningOnIOS13OrLater()) {
+    return;
+  }
+
   NSArray* cookies_to_send = @[ GetCookie1() ];
   ASSERT_TRUE(SetCookiesInCookieManager(cookies_to_send));
 
@@ -471,6 +482,11 @@ TEST_F(GaiaAuthFetcherIOSNSURLSessionBridgeTest, MAYBE_FetchWithRedirect) {
     return;
   }
 
+  // TODO(crbug.com/1106030): expected_cookies_set is failing on iOS12.
+  if (!base::ios::IsRunningOnIOS13OrLater()) {
+    return;
+  }
+
   OCMExpect([http_cookie_storage_mock_
       storeCookies:@[]
            forTask:url_session_data_task_mock_]);