Revert of [GRC] Process Coordination Unit support for Global Resource Controller

Revert of [GRC] Process Coordination Unit support for Global Resource Controller (patchset #7 id:120001 of https://codereview.chromium.org/2892443002/ )

Reason for revert:
CQed before having final LGTM

Original issue's description:
> [GRC] Process Coordination Unit support for Global Resource Controller
> 
> Quick design tl;dr:
> 
> * ProcessCoordinationUnitImpl
>   Specific implementation of CoordinationUnitImpl for tracking
>   processes within GRC of which it is derived from
> 
> * CoordinationUnitFactory
>   Currently supports making ProcessCoordinationUnitImpl for
>   CoordinationUnitType:kProcess and then a vanilla
>   CoordinationUnitImpl for any ohter CoordinationUnitType
> 
> * CoordinationUnitImplBaseTest
>   A base class for unit testing CoordinationUnitImpl and
>   its derived classes
> 
> R=oysteine@chromium.org, rockot@chromium.org
> BUG=724306
TBR=rockot@chromium.org,oysteine@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=724306

[matthalp, 2017-05-18 23:42:22]

The CQ bit was checked by matthalp@google.com

[matthalp, 2017-05-18 23:42:22]

Created Revert of [GRC] Process Coordination Unit support for Global Resource
Controller

[commit-bot: I haz the power, 2017-05-18 23:43:54]

CQ is trying da patch.

Follow status at:
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2017-05-18 23:43:56]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2017-05-18 23:43:57]

No L-G-T-M from a valid reviewer yet.
CQ run can only be started once the patch has received an L-G-T-M from a full
committer.
Even if an L-G-T-M may have been provided, it was from a non-committer,_not_ a
full super star committer.
Committers are members of the group "project-chromium-committers".
Note that this has nothing to do with OWNERS files.

[matthalp, 2017-05-18 23:45:34]

The CQ bit was unchecked by matthalp@google.com