Use {To/From}JavaTime for policy timestamps

components/policy/core/common/cloud/cloud_policy_refresh_scheduler_unittest.cc

 // Copyright (c) 2012 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/policy/core/common/cloud/cloud_policy_refresh_scheduler.h"
 
 #include <stdint.h>
 
 #include <memory>
 
@@ skipping 33 matching lines @@
   void SetUp() override {
     client_.SetDMToken("token");
 
     // Set up the protobuf timestamp to be one minute in the past. Since the
     // protobuf field only has millisecond precision, we convert the actual
     // value back to get a millisecond-clamped time stamp for the checks below.
     store_.policy_.reset(new em::PolicyData());
     base::Time now = base::Time::NowFromSystemTime();
     base::TimeDelta initial_age =
         base::TimeDelta::FromMinutes(kInitialCacheAgeMinutes);
-    store_.policy_->set_timestamp(
-        ((now - initial_age) - base::Time::UnixEpoch()).InMilliseconds());
-    last_update_ =
-        base::Time::UnixEpoch() +
-        base::TimeDelta::FromMilliseconds(store_.policy_->timestamp());
+    store_.policy_->set_timestamp((now - initial_age).ToJavaTime());
+    last_update_ = base::Time::FromJavaTime(store_.policy_->timestamp());
     last_update_ticks_ = base::TimeTicks::Now() +
                          (last_update_ - base::Time::NowFromSystemTime());
   }
 
   CloudPolicyRefreshScheduler* CreateRefreshScheduler() {
     EXPECT_EQ(0u, task_runner_->NumPendingTasks());
     CloudPolicyRefreshScheduler* scheduler =
         new CloudPolicyRefreshScheduler(&client_, &store_, task_runner_);
     scheduler->SetDesiredRefreshDelay(kPolicyRefreshRate);
     return scheduler;
@@ skipping 418 matching lines @@
     EXPECT_EQ(base::TimeDelta(), GetLastDelay());
     EXPECT_FALSE(task_runner_->HasPendingTask());
   }
 }
 
 INSTANTIATE_TEST_CASE_P(CloudPolicyRefreshSchedulerClientErrorTest,
                         CloudPolicyRefreshSchedulerClientErrorTest,
                         testing::ValuesIn(kClientErrorTestCases));
 
 }  // namespace policy