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This reverts commit 95cff9e7.

Reason for revert: failing tests, see https://crbug.com/1109621#c7

Original change's description:
> lacros: gnubby support for LaCrOS (hid_manager)
> 
> Because Gnubby and power gnubby in chromium would be considered as
> HID devices, and this CL would enable HID devices support for LaCrOS.
> 
> Before this CL: Lacros would try to access /dev/hidraw*, but the
> permission of it is root:hidraw 660, and lacros is running in chronos
> user permission. By the way, CrOS it is using dbus to access the
> permission_broker, and permission_broker would access these files for CrOS.
> 
> In this CL: Open a HidManager mojo between ash-chrome service and lacros service.
> Lacros would use AddReceiver to add a receiver to ash-chrome's HidManager.
> And the HidManager on ash-chrome would use permission_broker to access
> /dev/hidraw* files. In this solution, we wouldn't need to compile the
> permission_broker into lacros.
> 
> BUG=chromium:1109621
> TEST=tested gnubby manually on soraka
> 
> Change-Id: I18cfe9b5e93e260b9347df4b57ebe12a621f44a8
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2319089
> Commit-Queue: joe Chou <yich@google.com>
> Reviewed-by: Greg Kerr <kerrnel@chromium.org>
> Reviewed-by: Jorge Lucangeli Obes <jorgelo@chromium.org>
> Reviewed-by: Reilly Grant <reillyg@chromium.org>
> Reviewed-by: Scott Violet <sky@chromium.org>
> Reviewed-by: Erik Chen <erikchen@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#800003}

TBR=sky@chromium.org,jorgelo@chromium.org,reillyg@chromium.org,erikchen@chromium.org,kerrnel@chromium.org,yich@google.com

Change-Id: I7cd325c2704a0b4cd18522acc977f3b45159b313
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: chromium:1109621
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2366892Reviewed-by: Alexander Hendrich <hendrich@chromium.org>
Commit-Queue: Alexander Hendrich <hendrich@chromium.org>
Cr-Commit-Position: refs/heads/master@{#800027}