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base::ProtectedMemory is being deprecated because it's not widely used
enough to make a security impact and justify its maintenance burden.
Replace use of base::ProtectedMemory with raw function pointers and add
an attribute to disable CFI-icall checking.

Bug: 1018834
Change-Id: Iec40ef6edd087f2ae5277b2e0996bddd92675570
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1884598Reviewed-by: Thomas Anderson <thomasanderson@chromium.org>
Commit-Queue: Vlad Tsyrklevich <vtsyrklevich@chromium.org>
Cr-Commit-Position: refs/heads/master@{#710137}