Vulkan: Remove obsolete TODO.
Vulkan: Remove obsolete TODO.

Bug: angleproject:2397
Change-Id: I847772aa5ce1c27f7fd232d50d39c15f10135900
Reviewed-on: https://chromium-review.googlesource.com/1108515
Reviewed-by: Jamie Madill <7e492b4f1c8458024932de3ba475cbf015424c30@chromium.org>
Commit-Queue: Jamie Madill <7e492b4f1c8458024932de3ba475cbf015424c30@chromium.org>

ppy/angle,ppy/angle,ppy/angle,ppy/angle