Convert FieldTrialList to Accept a std::unique_ptr

base/metrics/field_trial.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 "base/metrics/field_trial.h"
 
 #include <algorithm>
+#include <utility>
 
 #include "base/build_time.h"
 #include "base/logging.h"
 #include "base/rand_util.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_util.h"
 #include "base/strings/stringprintf.h"
 #include "base/strings/utf_string_conversions.h"
 
 namespace base {
@@ skipping 283 matching lines @@
 // static
 FieldTrialList* FieldTrialList::global_ = NULL;
 
 // static
 bool FieldTrialList::used_without_global_ = false;
 
 FieldTrialList::Observer::~Observer() {
 }
 
 FieldTrialList::FieldTrialList(
-    const FieldTrial::EntropyProvider* entropy_provider)
-    : entropy_provider_(entropy_provider),
+    std::unique_ptr<const FieldTrial::EntropyProvider> entropy_provider)
+    : entropy_provider_(std::move(entropy_provider)),
       observer_list_(new ObserverListThreadSafe<FieldTrialList::Observer>(
           ObserverListBase<FieldTrialList::Observer>::NOTIFY_EXISTING_ONLY)) {
   DCHECK(!global_);
   DCHECK(!used_without_global_);
   global_ = this;
 
   Time two_years_from_build_time = GetBuildTime() + TimeDelta::FromDays(730);
   Time::Exploded exploded;
   two_years_from_build_time.LocalExplode(&exploded);
   kNoExpirationYear = exploded.year;
@@ skipping 326 matching lines @@
     return;
   }
   AutoLock auto_lock(global_->lock_);
   CHECK(!global_->PreLockedFind(trial->trial_name())) << trial->trial_name();
   trial->AddRef();
   trial->SetTrialRegistered();
   global_->registered_[trial->trial_name()] = trial;
 }
 
 }  // namespace base