Set the job name for the print job on the Mac.

BUG=http://crbug.com/29188
TEST=as in bug

Review URL: http://codereview.chromium.org/1997016

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@47056 0039d316-1c4b-4281-b951-d872f2087c98
  virtual void Run() {
    NotificationService::current()->Notify(
        NotificationType::PRINT_JOB_EVENT,
        Source<PrintJob>(static_cast<PrintJob*>(print_job_.get())),
        Details<JobEventDetails>(details_));
  }

  virtual void Run() {
    NotificationService::current()->Notify(
        NotificationType::PRINT_JOB_EVENT,
        Source<PrintJob>(static_cast<PrintJob*>(print_job_.get())),
        Details<JobEventDetails>(details_));
  }
