Revert of Add gpu support for Apple specific 'Vertex Arrays' functions (patchset...

Revert of Add gpu support for Apple specific 'Vertex Arrays' functions (patchset #2 id:20001 of https://codereview.chromium.org/754653002/)

Reason for revert:
Suspected in DM crashes, e.g.

2033 tasks left	 344M peak	  843ms	tabl-cuteoverload_skp
Signal 11:
_sigtramp (+0x1a)
create_surface(CanvasConfig const&, GrContext*) (+0x1b2)
test_WritePixels(skiatest::Reporter*, GrContextFactory*) (+0x8d4)
skiatest::WritePixelsClass::onRun(skiatest::Reporter*) (+0x21)
skiatest::Test::run() (+0x7c)
DM::GpuTestTask::draw(GrContextFactory*) (+0x8c)
DM::GpuTask::run(GrContextFactory*) (+0xa6)
DM::TaskRunner::wait() (+0x7f)
dm_main() (+0x33f)
main (+0x27)

On all MacMini platforms (the following URL with -Mac{10.6,10.7,10.8}- and -{Debug,Release}):

http://build.chromium.org/p/client.skia/builders/Test-Mac10.6-MacMini4.1-GeForce320M-x86_64-Debug

Original issue's description:
> Add gpu support for Apple specific 'Vertex Arrays' functions
>
> BUG=skia:
>
> Committed: https://skia.googlesource.com/skia/+/af000f469e1b0153ce445c96ca3d20e6d12224cc

TBR=bsalomon@google.com,paraboul@gmail.com
NOTREECHECKS=true
NOTRY=true
BUG=skia:

Review URL: https://codereview.chromium.org/750973003