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Cinnamon uses a different settings schema to specify the window button
layout compared to Gnome. This affects Ubuntu 14.04 using Cinnamon since
my change to use GSettings to read the button layout.

To fix this I had to add an enum value for Cinnamon.

system title bar, and changed window button layout.

Bug: 794376
Test: Forced the use of the GSettings provider, ran Chrome not using
Change-Id: I2e41df59a71467ac9161751c1fd3e6582c99fdab
Reviewed-on: https://chromium-review.googlesource.com/826027
Commit-Queue: Tim Brown <timbrown@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Thomas Anderson <thomasanderson@chromium.org>
Cr-Commit-Position: refs/heads/master@{#524161}