Disabled flaky test GetReferrerChainForNonSafeBrowsingUser

TBR=drubery@chromium.org

Bug: 1096975
Change-Id: I89b93e62d1dbb3d8d84c98cc7b75e047db4c2fbc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2252006Reviewed-by: Andy Paicu <andypaicu@chromium.org>
Commit-Queue: Andy Paicu <andypaicu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#780225}

chrome/browser/extensions/api/safe_browsing_private/safe_browsing_private_api_unittest.cc

@@ -142,7 +142,9 @@ TEST_F(SafeBrowsingPrivateApiUnitTest, GetReferrerChain) {
   ASSERT_TRUE(referrer_chain);
 }
 
-TEST_F(SafeBrowsingPrivateApiUnitTest, GetReferrerChainForNonSafeBrowsingUser) {
+// Flaky (crbug.com/1096975)
+TEST_F(SafeBrowsingPrivateApiUnitTest,
+       DISABLED_GetReferrerChainForNonSafeBrowsingUser) {
   // Disable Safe Browsing.
   browser()->profile()->GetPrefs()->SetBoolean(prefs::kSafeBrowsingEnabled,
                                                false);