Revert of Implement text rendering with NVPR

Revert of Implement text rendering with NVPR (https://codereview.chromium.org/196133014/)

Reason for revert:
This probably caused Win8 test bot fail during gm run:

http://108.170.217.252:10117/builders/Test-Win8-ShuttleA-GTX660-x86-Debug/builds/574

I can not identify any errors from the logs, so maybe it hung or something?

Original issue's description:
> Implement text rendering with NVPR
> 
> Use path rendering to render the text from outlines if supported by the
> GPU. Implement this in GrStencilAndCoverTextContext by copying large
> chunks of code from GrBitmapTextContext (drawText) and
> GrDistanceFieldTextContext (drawPosText).
> 
> The drawing is implemented with "instanced" path drawing
> functions.
> 
> Moves the creation of the "main" text context from SkGpuDevice to the
> GrContext::createTextContext. This is done because the decision of which
> text renderer is optimal can be made only with the internal
> implementation-specific information of the context.
> 
> Committed: http://code.google.com/p/skia/source/detail?r=13962

TBR=jvanverth@google.com,bsalomon@google.com,mtklein@google.com
NOTREECHECKS=true
NOTRY=true

Committed: http://code.google.com/p/skia/source/detail?r=13963

[Kimmo Kinnunen, 2014-03-27 14:16:16]

Created Revert of Implement text rendering with NVPR

[commit-bot: I haz the power, 2014-03-27 14:16:19]

CQ is trying da patch. Follow status at
https://skia-tree-status.appspot.com/cq/kkinnunen@nvidia.com/213123014/1

[commit-bot: I haz the power, 2014-03-27 14:16:19]

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

[commit-bot: I haz the power, 2014-03-27 14:16:20]

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 lowly 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.

[mtklein, 2014-03-27 14:19:02]

lgtm

[mtklein, 2014-03-27 14:19:08]

The CQ bit was checked by mtklein@google.com

[commit-bot: I haz the power, 2014-03-27 14:19:09]

CQ is trying da patch. Follow status at
https://skia-tree-status.appspot.com/cq/kkinnunen@nvidia.com/213123014/1

[commit-bot: I haz the power, 2014-03-27 14:19:20]

Change committed as 13963