Fix some potential Mach port leaks from mach_host_self using a new ScopedMachPort class.

base/process_util_mac.mm

 // 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 "base/process_util.h"
 
 #import <Cocoa/Cocoa.h>
 #include <crt_externs.h>
 #include <dlfcn.h>
 #include <errno.h>
@@ skipping 16 matching lines @@
 #include <new>
 #include <string>
 
 #include "base/debug/debugger.h"
 #include "base/eintr_wrapper.h"
 #include "base/file_util.h"
 #include "base/hash_tables.h"
 #include "base/lazy_instance.h"
 #include "base/logging.h"
 #include "base/mac/mac_util.h"
+#include "base/mac/scoped_mach_port.h"
 #include "base/string_util.h"
 #include "base/sys_info.h"
 #include "base/threading/thread_local.h"
 #include "third_party/apple_apsl/CFBase.h"
 #include "third_party/apple_apsl/malloc.h"
 #include "third_party/mach_override/mach_override.h"
 
 namespace base {
 
 void RestoreDefaultExceptionHandler() {
@@ skipping 414 matching lines @@
     task = port_provider_->TaskForPid(process_);
   if (task == MACH_PORT_NULL && process_ == getpid())
     task = mach_task_self();
   return task;
 }
 
 // ------------------------------------------------------------------------
 
 // Bytes committed by the system.
 size_t GetSystemCommitCharge() {
-  host_name_port_t host = mach_host_self();
+  base::mac::ScopedMachPort host(mach_host_self());
   mach_msg_type_number_t count = HOST_VM_INFO_COUNT;
   vm_statistics_data_t data;
   kern_return_t kr = host_statistics(host, HOST_VM_INFO,
                                      reinterpret_cast<host_info_t>(&data),
                                      &count);
   if (kr) {
     DLOG(WARNING) << "Failed to fetch host statistics.";
     return 0;
   }
 
@@ skipping 756 matching lines @@
   }
 }
 
 }  // namespace
 
 void EnsureProcessTerminated(ProcessHandle process) {
   WaitForChildToDie(process, kWaitBeforeKillSeconds);
 }
 
 }  // namespace base