Remove obsolete mac_gpu

Remove obsolete mac_gpu

BUG=chromium:426897
R=kbr@google.com,phajdan@google.com,reed@google.com

NOTREECHECKS=true

Committed: https://skia.googlesource.com/skia/+/a115b770f352f5967ff81c97d610ef1735ee102b

[phajdan, 2014-12-18 11:49:41]

LGTM

[Ken Russell (switch to Gerrit), 2014-12-18 18:35:58]

kbr@chromium.org changed reviewers:
+ kbr@chromium.org

[Ken Russell (switch to Gerrit), 2014-12-18 18:35:58]

lgtm

[Sergiy Byelozyorov, 2015-01-13 23:33:39]

The CQ bit was checked by sergiyb@chromium.org

[commit-bot: I haz the power, 2015-01-13 23:34:18]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/812963003/20001

[commit-bot: I haz the power, 2015-01-13 23:34:19]

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 2015-01-14 05:34 UTC

[Sergiy Byelozyorov, 2015-01-13 23:38:42]

The CQ bit was unchecked by sergiyb@chromium.org

[rmistry, 2015-01-14 14:40:59]

rmistry@google.com changed reviewers:
+ rmistry@google.com

[rmistry, 2015-01-14 14:40:59]

LGTM

[rmistry, 2015-01-14 15:21:54]

On 2015/01/14 14:40:59, rmistry wrote:
> LGTM

Is there is a trybot we can substitute for mac_gpu here?

[Sergiy Byelozyorov, 2015-01-15 19:13:48]

On 2015/01/14 15:21:54, rmistry wrote:
> On 2015/01/14 14:40:59, rmistry wrote:
> > LGTM
> 
> Is there is a trybot we can substitute for mac_gpu here?

Tests are now run on swarming and triggered by mac_chromium_rel_ng.

[Sergiy Byelozyorov, 2015-01-15 19:13:56]

The CQ bit was checked by sergiyb@chromium.org

[commit-bot: I haz the power, 2015-01-15 19:14:56]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/812963003/20001

[mtklein, 2015-01-15 20:32:50]

The CQ bit was unchecked by mtklein@google.com

[mtklein, 2015-01-15 20:32:53]

The CQ bit was checked by mtklein@google.com

[commit-bot: I haz the power, 2015-01-15 20:32:56]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/812963003/20001

[commit-bot: I haz the power, 2015-01-15 20:33:09]

Committed patchset #2 (id:20001) as
https://skia.googlesource.com/skia/+/a115b770f352f5967ff81c97d610ef1735ee102b