[Password Manager Cleanup] Replaces NULL -> nullptr.

components/password_manager/core/browser/password_manager.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/password_manager/core/browser/password_manager.h"
 
 #include "base/command_line.h"
 #include "base/metrics/field_trial.h"
 #include "base/metrics/histogram.h"
 #include "base/prefs/pref_service.h"
@@ skipping 39 matching lines @@
   static base::PlatformThreadId initial_thread_id =
       base::PlatformThread::CurrentId();
   DCHECK(initial_thread_id == base::PlatformThread::CurrentId());
 
   static bool ran_once = false;
   if (ran_once)
     return;
   ran_once = true;
 
   PasswordStore* store = client->GetPasswordStore();
-  // May be NULL in tests.
+  // May be null in tests.
   if (store) {
     store->ReportMetrics(client->GetSyncUsername(),
                          client->IsPasswordSyncEnabled(
                              password_manager::ONLY_CUSTOM_PASSPHRASE));
   }
   UMA_HISTOGRAM_BOOLEAN("PasswordManager.Enabled", password_manager_enabled);
 }
 
 bool ShouldDropSyncCredential() {
   std::string group_name =
@@ skipping 569 matching lines @@
     return;
 
   const base::FieldTrial::Probability kDivisor = 100;
   scoped_refptr<base::FieldTrial> trial(
       base::FieldTrialList::FactoryGetFieldTrial(
           kOtherPossibleUsernamesExperiment,
           kDivisor,
           "Disabled",
           2013, 12, 31,
           base::FieldTrial::ONE_TIME_RANDOMIZED,
-          NULL));
+          nullptr));
   base::FieldTrial::Probability enabled_probability =
       client_->GetProbabilityForExperiment(kOtherPossibleUsernamesExperiment);
   trial->AppendGroup("Enabled", enabled_probability);
 }
 
 bool PasswordManager::OtherPossibleUsernamesEnabled() const {
   return base::FieldTrialList::FindFullName(
              kOtherPossibleUsernamesExperiment) == "Enabled";
 }
 
@@ skipping 35 matching lines @@
           observers_,
           OnAutofillDataAvailable(preferred_match.username_value,
                                   preferred_match.password_value));
       break;
   }
 
   client_->PasswordWasAutofilled(best_matches);
 }
 
 }  // namespace password_manager