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These tests all use the PAGE_SIZE macro, which isn't correct under
Rosetta until the 11.0 SDK; have them use base::SystemPageSize()
instead.

Bug: 1102194
Change-Id: I752462b38fc7cd33f45678e3708d6b16b23b7fc2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2469224
Commit-Queue: Elly Fong-Jones <ellyjones@chromium.org>
Reviewed-by: Mark Mentovai <mark@chromium.org>
Cr-Commit-Position: refs/heads/master@{#817029}