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This CL changes usages of deprecated base::SharedMemory to
base::UnsafeSharedMemoryRegion. No functional changes.

Bug: 795291
Change-Id: I6d58ab32cb054760abaf5554e96d634569b69ccd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1919339Reviewed-by: Gary Kacmarcik <garykac@chromium.org>
Commit-Queue: Alex Ilin <alexilin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#715788}