permission_broker: Remove chronos from devbroker-access group

Chrome no longer gets access to devices by being part of this group. It
will be removed in a follow-up patch.

BUG=chromium:863566
TEST=None
CQ-DEPEND=CL:1137065,CL:1137104

Change-Id: I11ef6cade956017424e4d9d37eaff9d03af574e6
Reviewed-on: https://chromium-review.googlesource.com/1136497
Commit-Ready: Eric Caruso <ejcaruso@chromium.org>
Tested-by: Eric Caruso <ejcaruso@chromium.org>
Reviewed-by: Jorge Lucangeli Obes <jorgelo@chromium.org>
diff --git a/profiles/base/accounts/group/devbroker-access b/profiles/base/accounts/group/devbroker-access
deleted file mode 100644
index c764e32..0000000
--- a/profiles/base/accounts/group/devbroker-access
+++ /dev/null
@@ -1,4 +0,0 @@
-group:devbroker-access
-gid:403
-# So the browser can get brokered access to devices.
-users:chronos