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Nothing in production should rely on InProcessCommandBuffer creating its
own SharedContextState. If one is required, it must be obtained from the
task executor and thus shared with other contexts.

Just remove the code and fail init if SharedContextState is null when it
is required.

Change-Id: I7de905182c8127d17907caff4bfd005182037b15
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1970135Reviewed-by: Eric Karl <ericrk@chromium.org>
Commit-Queue: Bo <boliu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#726098}