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This CL removes deprecated RenderThread::HostAllocateSharedMemoryBuffer
since it's no longer used.

Bug: 795291
Change-Id: Ia0d4e3824d48a83ed2295351e62e4d518eb085af
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1916873Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Commit-Queue: Alex Ilin <alexilin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#715656}