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At stub destruction, CommandBufferHelper forgets all of its textures,
which leads to crashes on Mac. The fix is to stop doing that, now that
AbstractTextures remove the need to do so.

Additionally, the behavior of calling BindImage(nullptr) was changed in
the conversion to AbstractTexture; this change restores the original
behavior.

Bug: 869186
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: I27fb81408ac90d28752a6bb6cfbb5e3c56975c70
Reviewed-on: https://chromium-review.googlesource.com/1155812Reviewed-by: Antoine Labour <piman@chromium.org>
Commit-Queue: Dan Sanders <sandersd@chromium.org>
Cr-Commit-Position: refs/heads/master@{#580384}