Convert NULL to nullptr

util/test/executable_path_mac.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,
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
 #include "util/test/executable_path.h"
 
 #include <mach-o/dyld.h>
 #include <stdint.h>
 
 #include "base/logging.h"
 
 namespace crashpad {
 namespace test {
 
 base::FilePath ExecutablePath() {
   uint32_t executable_length = 0;
-  _NSGetExecutablePath(NULL, &executable_length);
+  _NSGetExecutablePath(nullptr, &executable_length);
   DCHECK_GT(executable_length, 1u);
   std::string executable_path(executable_length, std::string::value_type());
   int rv = _NSGetExecutablePath(&executable_path[0], &executable_length);
   DCHECK_EQ(rv, 0);
 
   return base::FilePath(executable_path);
 }
 
 }  // namespace test
 }  // namespace crashpad