C++11 declares a type safe null pointer

content/common/sandbox_linux/sandbox_linux.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 <dirent.h>
 #include <fcntl.h>
 #include <sys/resource.h>
 #include <sys/stat.h>
 #include <sys/time.h>
 #include <sys/types.h>
@@ skipping 95 matching lines @@
 
 LinuxSandbox::LinuxSandbox()
     : proc_fd_(-1),
       seccomp_bpf_started_(false),
       sandbox_status_flags_(kSandboxLinuxInvalid),
       pre_initialized_(false),
       seccomp_bpf_supported_(false),
       yama_is_enforcing_(false),
       setuid_sandbox_client_(sandbox::SetuidSandboxClient::Create())
 {
-  if (setuid_sandbox_client_ == NULL) {
+  if (setuid_sandbox_client_ == nullptr) {
     LOG(FATAL) << "Failed to instantiate the setuid sandbox client.";
   }
 #if defined(ADDRESS_SANITIZER) || defined(MEMORY_SANITIZER) || \
      defined(LEAK_SANITIZER) || defined(UNDEFINED_SANITIZER)
   sanitizer_args_ = make_scoped_ptr(new __sanitizer_sandbox_arguments);
   *sanitizer_args_ = {0};
 #endif
 }
 
 LinuxSandbox::~LinuxSandbox() {
@@ skipping 278 matching lines @@
 
 void LinuxSandbox::StopThreadAndEnsureNotCounted(base::Thread* thread) const {
   DCHECK(thread);
   base::ScopedFD proc_self_task(OpenProcTaskFd(proc_fd_));
   PCHECK(proc_self_task.is_valid());
   CHECK(sandbox::ThreadHelpers::StopThreadAndWatchProcFS(proc_self_task.get(),
                                                          thread));
 }
 
 }  // namespace content