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This CL removes all usages of base::SharedMemory and
base::SharedMemoryHandle from media::UnalignedSharedMemory since
there are no more callers of the constructor using these classes.

UnalignedSharedMemory itself is deprecated and should be eventually
removed as part of shared memory refactoring in future CLs.

Bug: 795291
Change-Id: I808c9fff08923f3414643e6258667dba2365f621
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1917376
Commit-Queue: Alex Ilin <alexilin@chromium.org>
Reviewed-by: Thomas Guilbert <tguilbert@chromium.org>
Cr-Commit-Position: refs/heads/master@{#715854}