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Fuchsia builds have been forcibly disabling safestack because it broke
V8 tests under Fuchsia, and forcibly enabling shadow-call-stack in
advance of it becoming the toolchain default, to gauge size impact.

Enabling shadow-call-stack under x64 is not recommended and breaks code
which uses C++ exceptions, which is true of some V8 code & tests.

Since the toolchain default should now be correct, remove the overrides
entirely.

Bug: 1028617, 821951
Change-Id: I36333f8cff5ea62584032a802337cdeb95f33466
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2014407
Auto-Submit: Wez <wez@chromium.org>
Reviewed-by: Kevin Marshall <kmarshall@chromium.org>
Commit-Queue: Wez <wez@chromium.org>
Cr-Commit-Position: refs/heads/master@{#734110}