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In order to enable SwiftShader as the default software GL implementation
on MacOS with EGL, a previous change had to be reverted where native
buffer formats were disabled for software GL. These formats are required
on MacOS with EGL, for IOSurface support, and SwiftShader supports the
same formats as Angle anyways, so only OSMesa needs this restriction.

Bug: chromium:726075
Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;luci.chromium.try:linux_optional_gpu_tests_rel;luci.chromium.try:mac_optional_gpu_tests_rel;luci.chromium.try:win_optional_gpu_tests_rel
Change-Id: I20d9bb4083807ad9ae6d5f7092b912ea18ecb679
Reviewed-on: https://chromium-review.googlesource.com/1024500Reviewed-by: Antoine Labour <piman@chromium.org>
Commit-Queue: Alexis Hétu <sugoi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#553511}