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Chrome will use Skia instead of using Vulkan API directly. So some code
will not be used anymore, so remove them.

Bug: 876825
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: Ia572cfa0937a3d09e139f88df22cff85cfb67abb
Reviewed-on: https://chromium-review.googlesource.com/1204921
Commit-Queue: Peng Huang <penghuang@chromium.org>
Reviewed-by: Antoine Labour <piman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#589928}