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These days PCScan and its bitmaps are lazily committed after startup.
Since bitmaps are not committed until PCScan is enabled, there is no
need for having a separate compile-time flag to avoid paying for used
memory.

Bug: 11297512
Change-Id: I9226a718be6309bc43de5f9f67e7c84e223eacbd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2539198
Commit-Queue: Michael Lippautz <mlippautz@chromium.org>
Reviewed-by: Bartek Nowierski <bartekn@chromium.org>
Cr-Commit-Position: refs/heads/master@{#827925}