Revert of command_buffer: Implement EXT_multisample_compatibility (patchset #6 id...

Revert of command_buffer: Implement EXT_multisample_compatibility (patchset #6 id:100001 of https://codereview.chromium.org/1231673006/ )

Reason for revert:
Seems to have broken
https://build.chromium.org/p/chromium.gpu/builders/Mac%2010.10%20Debug%20%28ATI%29/builds/3948

Original issue's description:
> command_buffer: Implement EXT_multisample_compatibility
>
> Implement EXT_multisample_compatibility OpenGL ES extension in command
> buffer.
>
> Skia needs this in order to enable and disable multisampling when
> using GL path rendering.
>
> BUG=506765
>
> Committed: https://crrev.com/e3237bbb682e52f92d5bd18dcab672677e4e3bc4
> Cr-Commit-Position: refs/heads/master@{#346847}

TBR=vmiura@chromium.org,piman@chromium.org,zmo@google.com,markkilgard@gmail.com,zmo@chromium.org,sievers@google.com,kkinnunen@nvidia.com
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=506765

Review URL: https://codereview.chromium.org/1311053006

Cr-Commit-Position: refs/heads/master@{#346885}