Revert of Mojo multiple command buffer support and sample

Revert of Mojo multiple command buffer support and sample (patchset #6 of https://codereview.chromium.org/451753003/)

Reason for revert:
Reverting because this closed the tree due to a failed compile step on Linux Builder (dbg)(32). See http://build.chromium.org/p/chromium.linux/builders/Linux%20Builder%20%28dbg%29%2832%29/builds/27701

Original issue's description:
> Mojo multiple command buffer support and sample
> 
> TBR=danakj@chromium.org for DEPS file shuffle that moves a "+ui/gfx"
> 
> Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=290157

TBR=darin@chromium.org,piman@chromium.org,jamesr@chromium.org
NOTREECHECKS=true
NOTRY=true

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=290162

[tdanderson, 2014-08-16 22:25:02]

Created Revert of Mojo multiple command buffer support and sample

[commit-bot: I haz the power, 2014-08-16 22:25:47]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/tdanderson@chromium.org/478103002/1

[commit-bot: I haz the power, 2014-08-16 22:26:39]

Committed patchset #1 (1) as 290162