Remove more MSVC compat hacks

Including PGO / WPO flags on Windows, which as far as I know aren't
used by anyone.

Bug: 1053958
Change-Id: I9479a10f921ca066ec2b702867ba687cdcb862ef
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2062880
Reviewed-by: Ken Rockot <[email protected]>
Reviewed-by: vmpstr <[email protected]>
Reviewed-by: Hans Wennborg <[email protected]>
Reviewed-by: Avi Drissman <[email protected]>
Commit-Queue: Nico Weber <[email protected]>
Cr-Original-Commit-Position: refs/heads/master@{#742850}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 768272463b364dde7f4111e4a37630126c891215
1 file changed