Revert of Add factory class for generating various flavors of GrTextContext. (https...

Revert of Add factory class for generating various flavors of GrTextContext. (https://codereview.chromium.org/144283002/)

Reason for revert:
Breaks Chrome. Need to fix template issue.

Original issue's description:
> Add factory class for generating various flavors of GrTextContext.
>
> This is the first pass of making Gr*TextContext more generic and easily
> subclassed. The next stage will be making GrBitmapTextContext and
> GrDistanceFieldTextContext more similar by moving the SkDraw loop into
> each subclass.
>
> BUG=skia:2018
>
> Committed: http://code.google.com/p/skia/source/detail?r=13142

R=bsalomon@google.com, reed@google.com
TBR=bsalomon@google.com, reed@google.com
NOTREECHECKS=true
NOTRY=true
BUG=skia:2018

Author: jvanverth@google.com

Review URL: https://codereview.chromium.org/145023006

git-svn-id: http://skia.googlecode.com/svn/trunk@13143 2bbb7eff-a529-9590-31e7-b0007b416f81