[Password Manager Cleanup] Replaces NULL -> nullptr.

components/password_manager/core/browser/password_generation_manager_unittest.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 <vector>
 
 #include "base/prefs/pref_registry_simple.h"
 #include "base/prefs/pref_service.h"
 #include "base/prefs/testing_pref_service.h"
 #include "base/strings/utf_string_conversions.h"
@@ skipping 16 matching lines @@
 
 namespace password_manager {
 
 namespace {
 
 class TestPasswordManagerDriver : public StubPasswordManagerDriver {
  public:
   TestPasswordManagerDriver(PasswordManagerClient* client)
       : password_manager_(client),
         password_generation_manager_(client, this),
-        password_autofill_manager_(this, NULL) {}
+        password_autofill_manager_(this, nullptr) {}
   ~TestPasswordManagerDriver() override {}
 
   // PasswordManagerDriver implementation.
   PasswordGenerationManager* GetPasswordGenerationManager() override {
     return &password_generation_manager_;
   }
   PasswordManager* GetPasswordManager() override { return &password_manager_; }
   PasswordAutofillManager* GetPasswordAutofillManager() override {
     return &password_autofill_manager_;
   }
@@ skipping 156 matching lines @@
   // be disabled.
   client_->set_is_off_the_record(true);
   PrefService* prefs = client_->GetPrefs();
   prefs->SetBoolean(prefs::kPasswordManagerSavingEnabled, true);
   client_->set_is_password_sync_enabled(true);
 
   EXPECT_FALSE(IsGenerationEnabled());
 }
 
 }  // namespace password_manager