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This will change the optional GPU testers to always test what we're shipping.

Change webgl2_conformance_d3d11_passthrough_tests to
webgl2_conformance_d3d11_validating_tests now that the passthrough command
decoder is used in webgl2_conformance_tests on Windows.

BUG=828135
BUG=602688

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: I600b53722d797693fd205166afcc4cefc2a4f242
Reviewed-on: https://chromium-review.googlesource.com/1107846
Commit-Queue: Kenneth Russell <kbr@chromium.org>
Reviewed-by: Kenneth Russell <kbr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#569873}