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This CL removes the last references to deprecated shared memory classes
in media/. It's a dead code that is no longer needed.

This also fixes some missing includes that used to be added
transitively.

Bug: 849207
Change-Id: I29483f5af8fe69bec69ace124e92b3aed91c6c83
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1919216
Auto-Submit: Alex Ilin <alexilin@chromium.org>
Reviewed-by: Thomas Guilbert <tguilbert@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Commit-Queue: Daniel Cheng <dcheng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#716409}