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crrev.com/c/2563385 showed a lot of good PMF improvements on Windows,
but came at a cost of regressions on non-Windows platforms:
https://chromeperf.appspot.com/group_report?rev=833127

This is possibly related to the fact that my CL took out the
optimization to not change permissions on recommit, out of necessity.
This affects only non-Windows platforms, because Windows doesn't have
this optimization to begin with. Therefore this CL disables it
everywhere except Windows.

Bug: 1155066, 1155062, 1155172, 1155172

Change-Id: Ie76801e58c8f65aa66cd9d37ad76020f0009149d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2569143
Commit-Queue: Bartek Nowierski <bartekn@chromium.org>
Commit-Queue: Kentaro Hara <haraken@chromium.org>
Auto-Submit: Bartek Nowierski <bartekn@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Cr-Commit-Position: refs/heads/master@{#833633}