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With https://crrev.com/c/1070158, base::Bind() supports
block via base::RetainBlock(). Converts uses of the now
deprecated base::BindBlock().

Bug: 701275
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: I103584b54f656f10e17c8e2439e0520c7690dbfe
Reviewed-on: https://chromium-review.googlesource.com/1090912Reviewed-by: Avi Drissman <avi@chromium.org>
Commit-Queue: Sylvain Defresne <sdefresne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#565956}