[Password Manager Cleanup] Replaces NULL -> nullptr.

components/password_manager/core/browser/password_form_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_form_manager.h"
 
 #include <algorithm>
 #include <set>
 
 #include "base/metrics/histogram.h"
@@ skipping 77 matching lines @@
     PasswordManager* password_manager,
     PasswordManagerClient* client,
     const base::WeakPtr<PasswordManagerDriver>& driver,
     const PasswordForm& observed_form,
     bool ssl_valid)
     : best_matches_deleter_(&best_matches_),
       observed_form_(CopyAndModifySSLValidity(observed_form, ssl_valid)),
       is_new_login_(true),
       has_generated_password_(false),
       password_manager_(password_manager),
-      preferred_match_(NULL),
+      preferred_match_(nullptr),
       state_(PRE_MATCHING_PHASE),
       client_(client),
       manager_action_(kManagerActionNone),
       user_action_(kUserActionNone),
       submit_result_(kSubmitResultNotSubmitted) {
   drivers_.push_back(driver);
   if (observed_form_.origin.is_valid())
     base::SplitString(observed_form_.origin.path(), '/', &form_path_tokens_);
 }
 
@@ skipping 779 matching lines @@
     LogPasswordGenerationSubmissionEvent(PASSWORD_SUBMITTED);
 }
 
 void PasswordFormManager::SubmitFailed() {
   submit_result_ = kSubmitResultFailed;
   if (has_generated_password_)
     LogPasswordGenerationSubmissionEvent(PASSWORD_SUBMISSION_FAILED);
 }
 
 }  // namespace password_manager