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

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

TBR=bsalomon@google.com,reed@google.com
NOTREECHECKS=true
NOTRY=true
BUG=skia:2018
Committed: http://code.google.com/p/skia/source/detail?r=13143

[jvanverth1, 2014-01-22 21:53:30]

Created Revert of Add factory class for generating various flavors of
GrTextContext.

[commit-bot: I haz the power, 2014-01-22 21:53:37]

CQ is trying da patch. Follow status at
https://skia-tree-status.appspot.com/cq/jvanverth@google.com/145023006/1

[commit-bot: I haz the power, 2014-01-22 21:53:49]

Presubmit check for 145023006-1 failed and returned exit status 1.

Running presubmit commit checks ...

** Presubmit ERRORS **
Since the CL is editing public API, you must have an LGTM from one of:
('reed@chromium.org', 'reed@google.com', 'bsalomon@chromium.org',
'bsalomon@google.com')

[jvanverth1, 2014-01-22 21:58:39]

LGTM, anyone?

[bsalomon, 2014-01-22 21:59:53]

On 2014/01/22 21:58:39, JimVV wrote:
> LGTM, anyone?

lgtm

[commit-bot: I haz the power, 2014-01-22 22:01:31]

CQ is trying da patch. Follow status at
https://skia-tree-status.appspot.com/cq/jvanverth@google.com/145023006/1

[commit-bot: I haz the power, 2014-01-22 22:01:46]

Change committed as 13143