Revert of Make SingleThreadProxy a SchedulerClient

Revert of Make SingleThreadProxy a SchedulerClient (https://codereview.chromium.org/134623005/)

Reason for revert:
Check if this CL breaks TouchActionBrowserTest.TouchActionNone test http://goo.gl/pwdNwL 

Also it was reported that this CL causing a number of crashes on the blink bots, e.g., 
http://build.chromium.org/p/tryserver.blink/builders/linux_blink_rel 

Original issue's description:
> Make SingleThreadProxy a SchedulerClient
> 
> This makes ui::Compositor no longer in charge of
> scheduling commits and draws, deferring it to cc::Scheduler.
> 
> BUG=329552, 287250
> 
> Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=280493

[Nikita (slow), 2014-06-28 17:51:57]

Created Revert of Make SingleThreadProxy a SchedulerClient

[commit-bot: I haz the power, 2014-06-28 17:52:46]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/nkostylev@chromium.org/342413005/1

[commit-bot: I haz the power, 2014-06-28 17:52:47]

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

[commit-bot: I haz the power, 2014-06-28 17:52:48]

No LGTM from a valid reviewer yet. Only full committers are accepted.
Even if an LGTM may have been provided, it was from a non-committer or
a provisional 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.