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On ARC, to support board-specific default apps, the arc-setup command
creates a symlink from /var/cache/arc_default_apps to
/usr/share/google-chrome/extensions/arc/<board>. This doesn't work on
ARCVM where arc-setup is not in use.

To support ARCVM, this CL checks the current board name in Chrome and
construct the /usr/share/google-chrome/extensions/arc/<board> path at
runtime.

BUG=b:144199481
TEST=try, ARCVM still starts

Change-Id: I8dc3f93010d55324914cf774e90c040ef7f0c66b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2020479
Commit-Queue: Yusuke Sato <yusukes@chromium.org>
Reviewed-by: Yury Khmel <khmel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#735207}