Convert NULL to nullptr

util/mac/service_management.cc

 // Copyright 2014 The Crashpad Authors. All rights reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
 //     http://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
@@ skipping 13 matching lines @@
 namespace {
 
 launch_data_t LaunchDataDictionaryForJob(const std::string& label) {
   base::mac::ScopedLaunchData request(
       launch_data_alloc(LAUNCH_DATA_DICTIONARY));
   launch_data_dict_insert(
       request, launch_data_new_string(label.c_str()), LAUNCH_KEY_GETJOB);
 
   base::mac::ScopedLaunchData response(launch_msg(request));
   if (launch_data_get_type(response) != LAUNCH_DATA_DICTIONARY) {
-    return NULL;
+    return nullptr;
   }
 
   return response.release();
 }
 
 }  // namespace
 
 namespace crashpad {
 
 bool ServiceManagementSubmitJob(CFDictionaryRef job_cf) {
@@ skipping 86 matching lines @@
   }
 
   if (launch_data_get_type(pid) != LAUNCH_DATA_INTEGER) {
     return 0;
   }
 
   return launch_data_get_integer(pid);
 }
 
 }  // namespace crashpad