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|gpu_memory_buffer_factory_| weak pointers are checked on the
IOThread.
Weak pointers should be invalidated on the same thread that
checks them.

This CL moves the destruction of |gpu_memory_buffer_factory_|
on the IOThread to avoid possible use after free issues.

Bug: 1152645

Change-Id: I0d42814f0e435a3746728515da1f32d08a1252cf
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2563077
Commit-Queue: Daniele Castagna <dcastagna@chromium.org>
Reviewed-by: Andres Calderon Jaramillo <andrescj@chromium.org>
Cr-Commit-Position: refs/heads/master@{#836827}