Revert "Enable MSAA on Gen8 Intel GPUs"

This reverts commit 0bda1cc640f301f134bad883aa78a926efff756a.

Reason for revert: Performance gap is fairly large.

Original change's description:
> Enable MSAA on Gen8 Intel GPUs
> 
> Bug: skia:9225 chromium:527565
> 
> Change-Id: I7c543bce011c247cd93cad90aca15c9754678202
> Reviewed-on: https://skia-review.googlesource.com/c/skia/+/225731
> Reviewed-by: Brian Salomon <bsalomon@google.com>
> Commit-Queue: Brian Osman <brianosman@google.com>

TBR=bsalomon@google.com,benjaminwagner@google.com,brianosman@google.com

Change-Id: I0e7f0bd53fbdcad0276462852021b9f3adc8ff6e
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: skia:9225 chromium:527565
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/226076
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
6 files changed