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The shared memory parts of ProcessMemoryDump apply to both legacy
base::SharedMemory as well as the new *SharedMemoryRegion and
*SharedMemoryMapping api. This change cleans up the comments but
does not change any code.

Bug: 795291
Change-Id: I3b88445ad04fe3b94996e5ff895110c5527df1cb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1567665
Commit-Queue: Antoine Labour <piman@chromium.org>
Auto-Submit: Matthew Cary <mattcary@chromium.org>
Reviewed-by: Antoine Labour <piman@chromium.org>
Reviewed-by: Alex Ilin <alexilin@chromium.org>
Reviewed-by: ssid <ssid@chromium.org>
Cr-Commit-Position: refs/heads/master@{#652577}