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This enables the CETCOMPAT linker flag for Windows marking binaries
as CET compatible. On supporting hardware this will cause Chrome to
run with Hardware Enforced Stack Protection for compatible modules.

CET will still be disabled for the renderer process as the feature
CetForRenderer is default-disabled.

x86 is not supported: build/config/compiler/BUILD.gn:2519

Tests: mini_installer on supporting hardware
Bug: 1131225
Change-Id: Ic5db6eca0acf4cdfb0eff0f624e4d4f4e5a7da50
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2602845Reviewed-by: Dirk Pranke <dpranke@google.com>
Reviewed-by: Will Harris <wfh@chromium.org>
Commit-Queue: Alex Gough <ajgo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#845041}