Revert of cc: change the GPU rasterization content veto into an MSAA trigger. (patchs...

Revert of cc: change the GPU rasterization content veto into an MSAA trigger. (patchset #26 id:490001 of https://codereview.chromium.org/1120773002/)

Reason for revert:
This seems to have broken gpu_rasterization_tests on the Android Debug (Nexus 7) bot:
http://build.chromium.org/p/chromium.gpu/builders/Android%20Debug%20%28Nexus%207%29/builds/20523

Original issue's description:
> cc: change the GPU rasterization content veto into an MSAA trigger.
>
> If MSAA is not supported, or does not have sufficient samples, let the content veto drop us to software
> rasterization as before.
>
> BUG=474727,453490
>
> Committed: https://crrev.com/9e53d21c5715201e97c273fffd1fa8f3133c44cc
> Cr-Commit-Position: refs/heads/master@{#328921}

TBR=aelias@chromium.org,enne@chromium.org,kbr@chromium.org,vmiura@chromium.org,senorblanco@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=474727,453490

Review URL: https://codereview.chromium.org/1136723002

Cr-Commit-Position: refs/heads/master@{#328951}