Update NetworkTimeQueries field trial config

components/network_time/network_time_tracker_unittest.cc

 // Copyright 2014 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/network_time/network_time_tracker.h"
 
 #include <memory>
 #include <string>
 #include <utility>
 
@@ skipping 30 matching lines @@
 const char kTimeBetweenFetchesHistogram[] =
     "NetworkTimeTracker.TimeBetweenFetches";
 }  // namespace
 
 class NetworkTimeTrackerTest : public ::testing::Test {
  public:
   ~NetworkTimeTrackerTest() override {}
 
   NetworkTimeTrackerTest()
       : io_thread_("IO thread"),
-        field_trial_test_(FieldTrialTest::CreateForUnitTest()),
+        field_trial_test_(new FieldTrialTest()),
         clock_(new base::SimpleTestClock),
         tick_clock_(new base::SimpleTestTickClock),
         test_server_(new net::EmbeddedTestServer) {
     base::Thread::Options thread_options;
     thread_options.message_loop_type = base::MessageLoop::TYPE_IO;
     EXPECT_TRUE(io_thread_.StartWithOptions(thread_options));
     NetworkTimeTracker::RegisterPrefs(pref_service_.registry());
 
     field_trial_test_->SetNetworkQueriesWithVariationsService(
         true, 0.0 /* query probability */,
@@ skipping 876 matching lines @@
             tracker_->GetNetworkTime(&out_network_time, nullptr));
   histograms.ExpectTotalCount(kTimeBetweenFetchesHistogram, 1);
   histograms.ExpectBucketCount(
       kTimeBetweenFetchesHistogram,
       (response_handler.GetTimeAtIndex(1) - response_handler.GetTimeAtIndex(0))
           .InMilliseconds(),
       1);
 }
 
 }  // namespace network_time