Revert of cc: Test one copy in mask unit tests

Revert of cc: Test one copy in mask unit tests (patchset #1 id:1 of https://codereview.chromium.org/739003002/)

Reason for revert:
[Sheriff] Speculative revert for making PixelResourceTest/LayerTreeHostMasksPixelTest.MaskOfClippedLayer/2 flaky.

Starting here:
http://build.chromium.org/p/chromium.win/builders/Win%207%20Tests%20x64%20%281%29/builds/18677

Original issue's description:
> cc: Test one copy in mask unit tests
>
> R=reveman@chromium.org
>
> Committed: https://crrev.com/1f1b197adbd5fdf449229646b26835f0df71e76f
> Cr-Commit-Position: refs/heads/master@{#304708}

TBR=reveman@chromium.org,enne@chromium.org
NOTREECHECKS=true
NOTRY=true

Committed: https://crrev.com/a272dd400623eec4e9a82919e2016bb02ace0654
Cr-Commit-Position: refs/heads/master@{#304786}

[Michael Achenbach, 2014-11-19 08:40:03]

Created Revert of cc: Test one copy in mask unit tests

[commit-bot: I haz the power, 2014-11-19 08:40:38]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/735963002/1

[commit-bot: I haz the power, 2014-11-19 08:41:04]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2014-11-19 08:41:51]

Patchset 1 (id:??) landed as
https://crrev.com/a272dd400623eec4e9a82919e2016bb02ace0654
Cr-Commit-Position: refs/heads/master@{#304786}

[Michael Achenbach, 2014-11-19 08:44:30]

Maybe other failures are connected too like:
http://build.chromium.org/p/chromium.win/buildstatus?builder=XP%20Tests%20%28...
http://build.chromium.org/p/chromium.win/buildstatus?builder=Win7%20Tests%20%...

[Michael Achenbach, 2014-11-19 12:36:26]

This revert has fixed the problems.