[Sheriff] Disabling LegacyTLSInterstitialTest.FixedServerDropsBypass

Test is flakey on all platforms, but causing Mac10.11 Builder to fail.

TBR=rogerta@chromium.org

Bug: 1153702

Change-Id: Ie3088761021783e2c8d84bfda29dd8bfea1525e4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2564215Reviewed-by: Charlene Yan <cyan@chromium.org>
Commit-Queue: Charlene Yan <cyan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#831907}

chrome/browser/ssl/ssl_browsertest.cc

@@ -7386,7 +7386,14 @@ IN_PROC_BROWSER_TEST_F(LegacyTLSInterstitialTest, PolicyOverridesInterstitial) {
 
 // Check that if we have bypassed the legacy TLS error previously and then the
 // server responded with TLS 1.2, we drop the error exception.
-IN_PROC_BROWSER_TEST_F(LegacyTLSInterstitialTest, FixedServerDropsBypass) {
+// Disabled due to flakiness. crbug.com/1153702
+#if defined(OS_MAC)
+#define MAYBE_FixedServerDropsBypass DISABLED_FixedServerDropsBypass
+#else
+#define MAYBE_FixedServerDropsBypass FixedServerDropsBypass
+#endif
+IN_PROC_BROWSER_TEST_F(LegacyTLSInterstitialTest,
+                       MAYBE_FixedServerDropsBypass) {
   int port;  // Save the port used so the different servers can be "identical".
 
   // Connect over TLS 1.0 and proceed through the interstitial to set an error