Revert of Update DisplayConfigurator to use the asynchronous tasks

Revert of Update DisplayConfigurator to use the asynchronous tasks (patchset #4 id:60001 of https://codereview.chromium.org/801493002/)

Reason for revert:
seems to be causing problems in display_unittests on the following bot: https://build.chromium.org/p/chromium.memory/builders/Linux%20Chromium%20OS%20ASan%20LSan%20Tests%20%281%29/builds/5095

Original issue's description:
> Update DisplayConfigurator to use the asynchronous tasks
>
> Now DisplayConfigurator can take advantage of asynchronous configuration APIs.
> Note: For X11, NativeDisplayDelegate is still implemented via synchronous calls
> so all configurations will be synchronous on X11.
>
> Notable changes:
>  1) EnterState(), UpdateCachedDisplays() and FindMirrorMode() have been moved
> into the DisplayLayoutManager implementation.
>  2) NativeDisplayDelegate's initialization has been moved before grabbing the
> server. Shouldn't cause any issues since the server doesn't need to be grabbed
> when initializing NDD.
>
> BUG=429746
> TEST=display_unittests and manually on Link with X11
>
> Committed: https://crrev.com/7547705543d6b711a166e513a43a4e43f93fd254
> Cr-Commit-Position: refs/heads/master@{#308175}

TBR=derat@chromium.org,dnicoara@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=429746
Committed: https://crrev.com/8dfe0b37a1871849c2f60bddcc8c1853f658a595
Cr-Commit-Position: refs/heads/master@{#308195}

[samuong, 2014-12-12 23:45:34]

Created Revert of Update DisplayConfigurator to use the asynchronous tasks

[commit-bot: I haz the power, 2014-12-12 23:47:26]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/797383002/1

[commit-bot: I haz the power, 2014-12-12 23:49:27]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2014-12-12 23:50:12]

Patchset 1 (id:??) landed as
https://crrev.com/8dfe0b37a1871849c2f60bddcc8c1853f658a595
Cr-Commit-Position: refs/heads/master@{#308195}