job_spooler_ should not be deleted from |PrinterJobHandler::OnJobSpool*|
Start thread with COM MTA and avoid initialization in JobSpoolerWin.

BUG=323540

Review URL: https://codereview.chromium.org/103443005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@239632 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 239632