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

BUG=119379
TEST=none


Review URL: https://chromiumcodereview.appspot.com/11188003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@162225 0039d316-1c4b-4281-b951-d872f2087c98
6 files changed