Revert of AppListController refactoring part 2: Ash's AppListShowerDelegate imlementation.

Revert of AppListController refactoring part 2: Ash's AppListShowerDelegate imlementation. (patchset #8 id:160001 of https://codereview.chromium.org/1856943003/ )

Reason for revert:
Suspected to be causing that Mac problem:
https://build.chromium.org/p/chromium/builders/Mac/builds/14169

Original issue's description:
> AppListController refactoring part 2: Ash's AppListShowerDelegate imlementation.
> 
> Part 1 of the refactoring: https://crrev.com/1830293002
> Design doc: https://docs.google.com/document/d/1M9vqTTuprMssRXs8UIVaFjQUq3lUxSzwrWoPjPvca6Q/edit?ts=56d0e9f0#heading=h.b2znwtuxd2x2
> 
> This CL adds ash::AppListShowerDelegate, which is the Ash implementation of
> app_list::AppListShowerDelegate. At this point it is unused - Ash is still using
> the old ash::AppListController class to control the app list.
> 
> BUG=557408
> 
> Committed: https://crrev.com/412803081c9d4f4321d267133512f45ce434fc10
> Cr-Commit-Position: refs/heads/master@{#386123}

TBR=sky@chromium.org,mgiuca@chromium.org,xiyuan@chromium.org,mfomitchev@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=557408

[beaudoin1, 2016-04-08 19:44:04]

Created Revert of AppListController refactoring part 2: Ash's
AppListShowerDelegate imlementation.

[commit-bot: I haz the power, 2016-04-08 19:44:29]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1872893002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1872893002/1

[commit-bot: I haz the power, 2016-04-08 19:44:30]

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

[commit-bot: I haz the power, 2016-04-08 19:44:31]

No L-G-T-M from a valid reviewer yet. 
CQ run can only be started by full committers or 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.
See http://www.chromium.org/getting-involved/become-a-committer
Note that this has nothing to do with OWNERS files.