Replace GR_MAC_BUILD by SK_BUILD_FOR_MAC.

Replace GR_*_BUILD by their SK_BUILD_FOR_* equivalents.

BUG=None
TEST=None, no functional changes.
R=bsalomon@google.com,robertphillips@google.com

Committed: http://code.google.com/p/skia/source/detail?r=11457

[tfarina, 2013-09-21 02:40:00]

Will this break Mac? I don't have a Mac to compile&test.

Regards,

[bsalomon, 2013-09-23 13:01:46]

On 2013/09/21 02:40:00, tfarina wrote:
> Will this break Mac? I don't have a Mac to compile&test.
> 
> Regards,

I submitted some Mac build try bots, so we shall see. Should we just go ahead
and do all the BUILD variants at once?

[tfarina, 2013-09-24 01:34:08]

On 2013/09/23 13:01:46, bsalomon wrote:
> On 2013/09/21 02:40:00, tfarina wrote:
> > Will this break Mac? I don't have a Mac to compile&test.
> > 
> > Regards,
> 
> I submitted some Mac build try bots, so we shall see. Should we just go ahead
> and do all the BUILD variants at once?
Done. PTAL.

[bsalomon, 2013-09-24 13:15:49]

On 2013/09/24 01:34:08, tfarina wrote:
> On 2013/09/23 13:01:46, bsalomon wrote:
> > On 2013/09/21 02:40:00, tfarina wrote:
> > > Will this break Mac? I don't have a Mac to compile&test.
> > > 
> > > Regards,
> > 
> > I submitted some Mac build try bots, so we shall see. Should we just go
ahead
> > and do all the BUILD variants at once?
> Done. PTAL.

lgtm, trying some compile bots

[commit-bot: I haz the power, 2013-09-24 16:17:25]

CQ is trying da patch. Follow status at
https://skia-tree-status.appspot.com/cq/tfarina@chromium.org/24253009/21002

[commit-bot: I haz the power, 2013-09-25 20:44:28]

Commit queue rejected this change because the description was changed
between the time the change entered the commit queue and the time it
was ready to commit. You can safely check the commit box again.

[commit-bot: I haz the power, 2013-09-25 20:45:48]

CQ is trying da patch. Follow status at
https://skia-tree-status.appspot.com/cq/tfarina@chromium.org/24253009/21002

[commit-bot: I haz the power, 2013-09-25 20:57:57]

Change committed as 11457