This instance of `pragma optimize` was from long ago when we built with
frame pointers disabled. We always build with frame pointers on these
days.

(Also, clang-cl ignores this pragma and will warn about it.)

Bug: chromium:505314
Change-Id: Ia125c9c54e6ec486247241102de1cb62c72d268b
Reviewed-on: https://chromium-review.googlesource.com/993423
Commit-Queue: Jakob Kummerow <jkummerow@chromium.org>
Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Cr-Commit-Position: refs/heads/master@{#52336}