Change base::TickClock to a ref counted class.

components/network_time/network_time_tracker.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 "base/basictypes.h"
 #include "base/i18n/time_formatting.h"
 #include "base/logging.h"
 #include "base/prefs/pref_registry_simple.h"
@@ skipping 17 matching lines @@
 const int kNumTimeMeasurements = 5;
 
 }  // namespace
 
 // static
 void NetworkTimeTracker::RegisterPrefs(PrefRegistrySimple* registry) {
   registry->RegisterDictionaryPref(prefs::kNetworkTimeMapping,
                                    new base::DictionaryValue());
 }
 
-NetworkTimeTracker::NetworkTimeTracker(scoped_ptr<base::TickClock> tick_clock,
-                                       PrefService* pref_service)
-    : tick_clock_(tick_clock.Pass()),
+NetworkTimeTracker::NetworkTimeTracker(
+    const scoped_refptr<base::TickClock>& tick_clock,
+    PrefService* pref_service)
+    : tick_clock_(tick_clock),
       pref_service_(pref_service),
       received_network_time_(false) {
   const base::DictionaryValue* time_mapping =
       pref_service_->GetDictionary(prefs::kNetworkTimeMapping);
   double local_time_js = 0;
   double network_time_js = 0;
   if (time_mapping->GetDouble("local", &local_time_js) &&
       time_mapping->GetDouble("network", &network_time_js)) {
     base::Time local_time_saved = base::Time::FromJsTime(local_time_js);
     base::Time local_time_now = base::Time::Now();
@@ skipping 65 matching lines @@
   if (network_time_.is_null())
     return false;
   DCHECK(!network_time_ticks_.is_null());
   *network_time = network_time_ + (time_ticks - network_time_ticks_);
   if (uncertainty)
     *uncertainty = network_time_uncertainty_;
   return true;
 }
 
 }  // namespace network_time