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Don't pass GpuChannelManager to InProcessGpuMemoryBufferManager. Most of
GpuChannelManager should only be accessed from the GPU thread so there
is the potential for unsafe operations. Both SyncPointManager and
GpuMemoryBufferFactory are thread safe so they should be fine.

Also ensure that GpuMemoryBuffer destruction callbacks dereference their
WeakPtr on the correct thread. GpuMemoryBuffers can be created and used
on any thread, even though InProcessGpuMemoryBufferManager isn't used
on multiple threads currently.

Bug: 902163
Change-Id: I8118def4fabd0307f0a58d403b9f9c08bc72fc6b
Reviewed-on: https://chromium-review.googlesource.com/c/1330030
Commit-Queue: kylechar <kylechar@chromium.org>
Reviewed-by: Sunny Sachanandani <sunnyps@chromium.org>
Reviewed-by: Antoine Labour <piman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#607761}