Update WebGL2 conformance test expectations for Win bots

BUG=491419,614418,662644,676848,680754,693090,705865,709484
TEST=GPU FYI bots
TBR=kbr@chromium.org,kainino@chromium.org
NOTRY=true
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.android:android_optional_gpu_tests_rel;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/2927233002
Cr-Commit-Position: refs/heads/master@{#478203}
1 file changed