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The goal is to eliminate usage of deprecated base::SharedMemory.

The shared memory region backing this 'canvas' is writable by
the plugin process (PPB_ImageData_Proxy) and its hosting renderer
(PPB_ImageData_Impl). Both processes must keep writable shared
memory handles because PPB_ImageData_API interface exposes
GetSharedMemory() method.

Hence move the usage of base::SharedMemory into
base::UnsafeSharedMemoryRegion.

Bug: 795291
Change-Id: I4766061db7f0a1e2bedfcb9459490acee6c8b2ef
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1586039
Commit-Queue: Alex Ilin <alexilin@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Bill Budge <bbudge@chromium.org>
Reviewed-by: Antoine Labour <piman@chromium.org>
Auto-Submit: Alex Ilin <alexilin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#659109}