[Sheriff] Disable CaptivePortalBrowserTest.SecureDnsCaptivePortal

This test appears to be flaky. Further details on the bug.

TBR=mmenke@chromium.org

Bug: 11139282
Change-Id: I559a75c6840502c5683b56616b703678899195a6
No-Presubmit: true
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2341821Reviewed-by: Reilly Grant <reillyg@chromium.org>
Commit-Queue: Reilly Grant <reillyg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#795721}

chrome/browser/captive_portal/captive_portal_browsertest.cc

@@ -2832,7 +2832,9 @@ IN_PROC_BROWSER_TEST_F(CaptivePortalBrowserTest,
             GetInterstitialType(broken_tab_contents));
 }
 
-IN_PROC_BROWSER_TEST_F(CaptivePortalBrowserTest, SecureDnsCaptivePortal) {
+// Disabled due to flake. https://crbug.com/1113928
+IN_PROC_BROWSER_TEST_F(CaptivePortalBrowserTest,
+                       DISABLED_SecureDnsCaptivePortal) {
   PrefService* local_state = g_browser_process->local_state();
   local_state->SetString(prefs::kDnsOverHttpsMode,
                          SecureDnsConfig::kModeSecure);