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Uses the new WritableUnalignedMapping class, which changes the ownership
semantics. See the bug for details on the overall plan.

Bug: 849207
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: Ie3379f1dabb0c0fa7fae7451534bd5fa1b01416e
Reviewed-on: https://chromium-review.googlesource.com/1117696Reviewed-by: Daniele Castagna <dcastagna@chromium.org>
Reviewed-by: Alexandr Ilin <alexilin@chromium.org>
Commit-Queue: Matthew Cary <mattcary@chromium.org>
Cr-Commit-Position: refs/heads/master@{#577823}