Mike Conley 2606bb64e2 Bug 1199434 - Fire an event when the print engine encounters an error. r=smaug
The print engine used to directly cause a prompt to be displayed in the most
recent window in the event of an error. This patch causes the print engine to
fire an event instead so that the front-end can choose to display or ignore
the error.

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extra : commitid : J2icIUiO8Lv
extra : rebase_source : 0288d18cf29b8c167da2be9b907f234cf4c3f2b7
2015-09-16 16:12:43 -04:00
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