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This CL replaces the deprecated base::SharedMemoryHandle used to hold the crash information
in nacl:: classes with new shared memory api. The plugin side writes to the shared memory
region using base::WritableSharedMemoryRegion and sends a read only version of the region
to the renderer process through the browser. The renderer side reads the crash info using
base::ReadOnlySharedMemoryRegion.

Change-Id: I335040a9884d6dc79f107070c954a3ff250458a2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1565974Reviewed-by: Derek Schuff <dschuff@chromium.org>
Reviewed-by: Alex Ilin <alexilin@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Robert Sesek <rsesek@chromium.org>
Commit-Queue: Tanmoy Mollik <triploblastic@google.com>
Cr-Commit-Position: refs/heads/master@{#658493}