Use {To/From}JavaTime for policy timestamps

chrome/browser/policy/cloud/cloud_policy_invalidator_unittest.cc

 // Copyright 2013 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 "chrome/browser/policy/cloud/cloud_policy_invalidator.h"
 
 #include <stdint.h>
 
 #include <memory>
 #include <string>
@@ skipping 267 matching lines @@
 
 void CloudPolicyInvalidatorTest::StorePolicy(PolicyObject object,
                                              int64_t invalidation_version,
                                              bool policy_changed,
                                              const base::Time& time) {
   em::PolicyData* data = new em::PolicyData();
   if (object != POLICY_OBJECT_NONE) {
     data->set_invalidation_source(GetPolicyObjectId(object).source());
     data->set_invalidation_name(GetPolicyObjectId(object).name());
   }
-  data->set_timestamp((time - base::Time::UnixEpoch()).InMilliseconds());
+  data->set_timestamp(time.ToJavaTime());
   // Swap the policy value if a policy change is desired.
   if (policy_changed)
     policy_value_cur_ = policy_value_cur_ == policy_value_a_ ?
         policy_value_b_ : policy_value_a_;
   data->set_policy_value(policy_value_cur_);
   store_.invalidation_version_ = invalidation_version;
   store_.policy_.reset(data);
   base::DictionaryValue policies;
   policies.SetInteger(
       key::kMaxInvalidationFetchDelay,
@@ skipping 796 matching lines @@
     CloudPolicyInvalidatorUserTypedTest,
     testing::Values(em::DeviceRegisterRequest::ANDROID_BROWSER));
 #else
 INSTANTIATE_TEST_CASE_P(
     CloudPolicyInvalidatorUserTypedTestInstance,
     CloudPolicyInvalidatorUserTypedTest,
     testing::Values(em::DeviceRegisterRequest::BROWSER));
 #endif
 
 }  // namespace policy