Remove TimeTicks::UnixEpoch from net_unittests

net/base/network_quality_estimator_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 "net/base/network_quality_estimator.h"
 
 #include <stdint.h>
 #include <limits>
 #include <map>
 #include <utility>
@@ skipping 356 matching lines @@
 
 // Verifies that the percentiles are correctly computed. Observations have
 // different timestamps with half the observations being very old and the rest
 // of them being very recent. Percentiles should factor in recent observations
 // much more heavily than older samples. Kbps percentiles must be in decreasing
 // order. RTT percentiles must be in increasing order.
 TEST(NetworkQualityEstimatorTest, PercentileDifferentTimestamps) {
   std::map<std::string, std::string> variation_params;
   TestNetworkQualityEstimator estimator(variation_params);
   base::TimeTicks now = base::TimeTicks::Now();
-  base::TimeTicks very_old = base::TimeTicks::UnixEpoch();
+  base::TimeTicks very_old = now - base::TimeDelta::FromDays(365);
 
   // First 50 samples have very old timestamp.
   for (int i = 1; i <= 50; ++i) {
     estimator.downstream_throughput_kbps_observations_.AddObservation(
         NetworkQualityEstimator::ThroughputObservation(
             i, very_old, NetworkQualityEstimator::URL_REQUEST));
     estimator.rtt_observations_.AddObservation(
         NetworkQualityEstimator::RttObservation(
             base::TimeDelta::FromMilliseconds(i), very_old,
             NetworkQualityEstimator::URL_REQUEST));
@@ skipping 717 matching lines @@
 
   EXPECT_EQ(4U, rtt_observer.observations().size());
   EXPECT_EQ(2U, throughput_observer.observations().size());
 
   EXPECT_EQ(tcp_rtt.InMilliseconds(), rtt_observer.observations().at(2).rtt_ms);
   EXPECT_EQ(quic_rtt.InMilliseconds(),
             rtt_observer.observations().at(3).rtt_ms);
 }
 
 }  // namespace net