GitLab

CUPS printers will now be selectable in the print menus.

NOTE: This does not enable printing to said printers.

BUG=607668

TEST=Launch chrome with --enable-native-cups flag, open print preview,
change printers.  See that CUPS printers are listed as available
printers.

Review-Url: https://codereview.chromium.org/1934013002
Cr-Commit-Position: refs/heads/master@{#402654}