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The task runner is used at HandlePendingEventsAndPromises, and I think
an unthorttled task runner is not necessary here.

WebGLSync:
The unthrottled task runenr was introduced at https://chromium-review.googlesource.com/c/chromium/src/+/906402

WebGLQuery and WebGLTimerQueryExt:
The unthrottled task runner was introduced at https://codereview.chromium.org/2341043002

We plan to eliminate kUnthrottled, kUnspecedTimer and kUnspecedLoading
and replace them with appropriate kInternal* task types.

Task type guideline: https://bit.ly/2vMAsQ4

Bug: 836410
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: I2cc48425aaef973432f8bdee6fbb111b0e9a9188
Reviewed-on: https://chromium-review.googlesource.com/1055369Reviewed-by: Sami Kyöstilä <skyostil@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Commit-Queue: Hajime Hoshi <hajimehoshi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#558214}