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

base/base.gypi

 # 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.
 
 {
   'target_defaults': {
     'variables': {
       'base_target': 0,
     },
     'target_conditions': [
@@ skipping 198 matching lines @@
           'mac/mac_util.mm',
           'mac/objc_property_releaser.h',
           'mac/objc_property_releaser.mm',
           'mac/os_crash_dumps.cc',
           'mac/os_crash_dumps.h',
           'mac/scoped_aedesc.h',
           'mac/scoped_authorizationref.h',
           'mac/scoped_cftyperef.h',
           'mac/scoped_ioobject.h',
           'mac/scoped_launch_data.h',
+          'mac/scoped_mach_port.h',
           'mac/scoped_nsautorelease_pool.h',
           'mac/scoped_nsautorelease_pool.mm',
           'mac/scoped_nsexception_enabler.h',
           'mac/scoped_nsexception_enabler.mm',
           'mac/scoped_sending_event.h',
           'mac/scoped_sending_event.mm',
           'mach_ipc_mac.h',
           'mach_ipc_mac.mm',
           'memory/aligned_memory.cc',
           'memory/aligned_memory.h',
@@ skipping 474 matching lines @@
           # Remove all unnecessary files for build_nexe.py to avoid exceeding
           # command-line-string limitation when building NaCl on Windows.
           ['OS == "win" and >(nacl_untrusted_build)==1', {
               'sources/': [ ['exclude', '\\.h$'] ],
           }],
         ],
       }],
     ],
   },
 }