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This change consolidates all QueueShareMemoryRegionWhenReady() overrides
in the base class implementation, because, it turns out, it's the same
code on all platforms.

Bug: 1043306
Change-Id: If26b5e9b5e2361e4e66b21bcfdd2e93484c1a15b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2421637
Commit-Queue: Olivier Yiptong <oyiptong@chromium.org>
Reviewed-by: Joshua Bell <jsbell@chromium.org>
Auto-Submit: Olivier Yiptong <oyiptong@chromium.org>
Cr-Commit-Position: refs/heads/master@{#809468}