Remove GrContext from GrDrawTarget

Remove GrContext from GrDrawTarget

Still exists on clip target (for now).

Committed: https://skia.googlesource.com/skia/+/4061b1262e931be19e1176cbd0e93b8c268eb131

[bsalomon, 2015-05-29 17:12:32]

bsalomon@google.com changed reviewers:
+ joshualitt@google.com

[bsalomon, 2015-05-29 17:12:40]

The CQ bit was checked by bsalomon@google.com

[commit-bot: I haz the power, 2015-05-29 17:13:03]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1166553002/80001

[commit-bot: I haz the power, 2015-05-29 17:13:05]

Note for Reviewers:
The CQ is waiting for an approval.
If you believe that the CL is not ready yet, or if you would like to L-G-T-M
with comments then please uncheck the CQ checkbox.

Waiting for LGTM from valid reviewer(s) till 2015-05-29 23:13 UTC

[joshualitt, 2015-05-29 17:16:47]

On 2015/05/29 17:13:05, commit-bot: I haz the power wrote:
> Note for Reviewers:
> The CQ is waiting for an approval.
> If you believe that the CL is not ready yet, or if you would like to L-G-T-M
> with comments then please uncheck the CQ checkbox.
> 
> Waiting for LGTM from valid reviewer(s) till 2015-05-29 23:13 UTC

lgtm

[commit-bot: I haz the power, 2015-05-29 17:26:23]

Committed patchset #5 (id:80001) as
https://skia.googlesource.com/skia/+/4061b1262e931be19e1176cbd0e93b8c268eb131