This reverts commit 89417c1c.

Reason for revert: 
This would break AOSP image that does not suppose to have Play Store sign in.

Original change's description:
> arc: Disable ARC on non-Google clients.
> 
> It is possible to make a Chromium build with custom client id that
> defines non-Google build.  In this case auth code cannot be requested
> and ARC fails with server communication  error. This CL disables ARC
> on such builds.
> 
>       this CL this leads to SERVER_COMMUNICATION_ERROR on attempt to
>       use ARC. With this CL ARC UI is not available and do not
>       start. If I redefine client to Chrome again using oauth2-client*
>       flags or build Chrome build, then ARC is available again and can
>       be started without error.
> 
> Test: Manually on device. Build image with mozilla client id. Without
> Bug: b/67410968
> Change-Id: I6bcfcb8c5a184a52df74020552404ff86b05051b
> Reviewed-on: https://chromium-review.googlesource.com/699767


> Commit-Queue: Yury Khmel <khmel@google.com>
> Reviewed-by: Roger Tawa <rogerta@chromium.org>
> Reviewed-by: Luis Hector Chavez <lhchavez@chromium.org>
> Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#507883}

TBR=xiyuan@chromium.org,rogerta@chromium.org,lhchavez@chromium.org,khmel@google.com

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: b/67410968
Change-Id: Ic13ec52a41b11c0ac10e7ded691ecda55ddc75f8
Reviewed-on: https://chromium-review.googlesource.com/719176


Reviewed-by: Yury Khmel <khmel@chromium.org>
Commit-Queue: Yury Khmel <khmel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#508746}