Disable all GPU features on GeForce 8600M on macOS.

Rendering corruption is seen on this GPU, which is nearly 10 years
old. Fall back to software rendering.

BUG=676975
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel

Review-Url: https://codereview.chromium.org/2626973002
Cr-Commit-Position: refs/heads/master@{#442990}