Revert of Make GrTextContext be owned by the GrDrawContext

Revert of Make GrTextContext be owned by the GrDrawContext (patchset #7 id:120001 of https://codereview.chromium.org/1175553002/)

Reason for revert:
Breaking Test-Win8-MSVC-ShuttleA-GPU-GTX660-x86_64-Debug ?

https://build.chromium.org/p/client.skia/builders/Test-Win8-MSVC-ShuttleA-GPU-GTX660-x86_64-Debug/builds/436/steps/dm/logs/stdio


Original issue's description:
> Make GrTextContext be owned by the GrDrawContext
> 
> This CL makes the GrTextContext be owned (and hidden) by the GrDrawContext. This funnels all the drawText* calls through the GrDrawContext and hides the (dispreferred) GrPipelineBuilder drawText variant. 
> 
> Some consequences of this are:
> 
> GrDrawContext now has to get the text drawing settings (i.e., SkDeviceProperties & useDFT). This means that we need a separate GrDrawContext for each combination of pixel geometry and DFT-use.
> 
> All the GrTextContext-derived classes now get a back pointer to the originating GrDrawContext so their method calls no longer take one.
> 
> Committed: https://skia.googlesource.com/skia/+/5b16e740fe6ab6d679083d06f07651602265081b

TBR=joshualitt@chromium.org,joshualitt@google.com,jvanverth@google.com,reed@google.com,robertphillips@google.com
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Committed: https://skia.googlesource.com/skia/+/781d58215f03cfe43c6b5f7bf1a578bc3c9a1e6f

[bsalomon, 2015-06-16 22:02:46]

Created Revert of Make GrTextContext be owned by the GrDrawContext

[commit-bot: I haz the power, 2015-06-16 22:03:04]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1178383003/1

[commit-bot: I haz the power, 2015-06-16 22:03:16]

Committed patchset #1 (id:1) as
https://skia.googlesource.com/skia/+/781d58215f03cfe43c6b5f7bf1a578bc3c9a1e6f