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Control Flow Integrity [1] indirect call checking verifies that function
pointers only call valid functions with a matching type signature. It
can't verify dynamically resolved function pointers, instead store them
in ProtectedMemory and calls them using base::UnsanitizedCfiCall() to
disable cfi-icall checks.

[1] https://www.chromium.org/developers/testing/control-flow-integrity

BUG=771365

Change-Id: I79b4c8a2bb6b7a77ff35860e7d4f7ad226745dca
Reviewed-on: https://chromium-review.googlesource.com/1000426Reviewed-by: Thomas Anderson <thomasanderson@chromium.org>
Commit-Queue: Peter Collingbourne <pcc@chromium.org>
Cr-Commit-Position: refs/heads/master@{#549250}