Disable a flaky SSLUIWorkerFetchTest.

The MixedContentSettings_DisallowRunningInsecureContent test case is
flaky on Mac.

Bug: 1116670
Change-Id: I307c9947284af06ede7019fc60e6c6acca8a0e20
Tbr: estark@chromium.org
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2358429Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>
Cr-Commit-Position: refs/heads/master@{#798404}

chrome/browser/ssl/ssl_browsertest.cc

@@ -3728,8 +3728,17 @@ IN_PROC_BROWSER_TEST_P(SSLUIWorkerFetchTest,
 // This test checks the behavior of mixed content blocking for the requests
 // from a dedicated worker by changing the settings in WebPreferences
 // with allow_running_insecure_content = false.
-IN_PROC_BROWSER_TEST_P(SSLUIWorkerFetchTest,
-                       MixedContentSettings_DisallowRunningInsecureContent) {
+// Disabled due to being flaky. crbug.com/1116670
+#if defined(OS_MAC)
+#define MAYBE_MixedContentSettings_DisallowRunningInsecureContent \
+  DISABLED_MixedContentSettings_DisallowRunningInsecureContent
+#else
+#define MAYBE_MixedContentSettings_DisallowRunningInsecureContent \
+  MixedContentSettings_DisallowRunningInsecureContent
+#endif
+IN_PROC_BROWSER_TEST_P(
+    SSLUIWorkerFetchTest,
+    MAYBE_MixedContentSettings_DisallowRunningInsecureContent) {
   ChromeContentBrowserClientForMixedContentTest browser_client;
   content::ContentBrowserClient* old_browser_client =
       content::SetBrowserClientForTesting(&browser_client);