Disable SSLErrorClassificationTest.GetClockState test

components/ssl_errors/error_classification_unittest.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "components/ssl_errors/error_classification.h"
 
 #include "base/files/file_path.h"
 #include "base/memory/ptr_util.h"
 #include "base/message_loop/message_loop.h"
 #include "base/strings/string_split.h"
@@ skipping 195 matching lines @@
   EXPECT_EQ(4u, ssl_errors::GetLevenshteinDistance("", "abcd"));
   EXPECT_EQ(4u, ssl_errors::GetLevenshteinDistance("abcd", ""));
 
   EXPECT_EQ(4u, ssl_errors::GetLevenshteinDistance("xxx", "xxxxxxx"));
   EXPECT_EQ(4u, ssl_errors::GetLevenshteinDistance("xxxxxxx", "xxx"));
 
   EXPECT_EQ(7u, ssl_errors::GetLevenshteinDistance("yyy", "xxxxxxx"));
   EXPECT_EQ(7u, ssl_errors::GetLevenshteinDistance("xxxxxxx", "yyy"));
 }
 
-TEST_F(SSLErrorClassificationTest, GetClockState) {
+// Flaky, see https://bugs.chromium.org/p/chromium/issues/detail?id=668539.
+TEST_F(SSLErrorClassificationTest, DISABLED_GetClockState) {
   // This test aims to obtain all possible return values of
   // |GetClockState|.
   const char kBuildTimeHistogram[] = "interstitial.ssl.clockstate.build_time";
   base::HistogramTester histograms;
   histograms.ExpectTotalCount(kBuildTimeHistogram, 0);
   histograms.ExpectTotalCount(kNetworkTimeHistogram, 0);
   TestingPrefServiceSimple pref_service;
   network_time::NetworkTimeTracker::RegisterPrefs(pref_service.registry());
   base::MessageLoop loop;
   network_time::NetworkTimeTracker network_time_tracker(
@@ skipping 217 matching lines @@
   clock->Advance(base::TimeDelta::FromDays(1));
   // GetClockState() will fall back to the build time heuristic.
   ssl_errors::GetClockState(clock->Now(), &network_time_tracker);
   histograms.ExpectTotalCount(kNetworkTimeHistogram, 8);
   histograms.ExpectBucketCount(
       kNetworkTimeHistogram, ssl_errors::NETWORK_CLOCK_STATE_UNKNOWN_SYNC_LOST,
       1);
 
   io_thread.Stop();
 }