Revert of cc: Single-threaded impl-side painting for unit tests

Revert of cc: Single-threaded impl-side painting for unit tests (patchset #5 id:80001 of https://codereview.chromium.org/508373002/)

Reason for revert:
LayerTreeHostContextTestDontUseLostResources.RunSingleThread_DirectRenderer_MainThreadPaint Fails on Win7 bot after this change.

Speculative revert by sheriff.

http://build.chromium.org/p/chromium.win/builders/Win7%20Tests%20%28dbg%29%281%29/builds/30957/steps/cc_unittests/logs/RunSingleThread_DirectRenderer_MainThreadPaint

Original issue's description:
> cc: Single-threaded impl-side painting for unit tests
> 
> This adds methods to SingleThreadProxy to support impl-side painting
> when using the scheduler.  This allows most unit tests to test impl-side
> painting classes through both the single and threaded paths.
> 
> The biggest caveat to this approach is the "commit waits for activation"
> logic that mailboxes want to use.  Because there is no easy way to block
> the only thread there is while activation happens, activation always
> happens immediately during commit, even if the tree is not ready.  To
> cause the tree to wait to draw until it is ready, drawing is prevented
> via SetRequiresHighResToDraw.  This prepares the way for the future
> where the SingleThreadProxy will likely commit directly to the active
> tree.
> 
> The synchronous CompositeImmediately function does not support impl-side
> painting yet.  This is the path used by everything but unit tests at
> this point.
> 
> R=danakj@chromium.org
> BUG=329553
> 
> Committed: https://chromium.googlesource.com/chromium/src/+/7eee8e03582772716b820001af75343f6341e6e8

TBR=danakj@chromium.org,enne@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=329553
Committed: https://crrev.com/ea769fd2090e40950c84f9df851ffec5792bf04e
Cr-Commit-Position: refs/heads/master@{#293685}

[henrika (OOO until Aug 14), 2014-09-08 06:51:30]

Created Revert of cc: Single-threaded impl-side painting for unit tests

[henrika (OOO until Aug 14), 2014-09-08 06:58:52]

The CQ bit was unchecked by henrika@chromium.org

[henrika (OOO until Aug 14), 2014-09-08 06:58:58]

The CQ bit was checked by henrika@chromium.org

[commit-bot: I haz the power, 2014-09-08 07:14:45]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/henrika@chromium.org/550073002/1

[commit-bot: I haz the power, 2014-09-08 07:20:34]

Committed patchset #1 (id:1) as aba2c47b1595c8fd7f85263c22e3dd67642dfedb

[commit-bot: I haz the power, 2014-09-10 03:44:58]

Patchset 1 (id:??) landed as
https://crrev.com/ea769fd2090e40950c84f9df851ffec5792bf04e
Cr-Commit-Position: refs/heads/master@{#293685}