Revert 280493 "Make SingleThreadProxy a SchedulerClient"

Revert 280493 "Make SingleThreadProxy a SchedulerClient"

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

> 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
> 
> Review URL: https://codereview.chromium.org/134623005

TBR=enne@chromium.org

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=280521

[Nikita (slow), 2014-06-28 17:57:36]

Committed patchset #1 manually as r280521 (tree was closed).