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The CL enables PCScan when
 1) PA-Everywhere,
 2) --enable-features=PartitionAllocPCScan.
and makes sure that it's enabled after FeatureList is initialized.

Bug: 11297512
Change-Id: Ibcf21a503cdf0cb1a085629ab77d4e87061f8fa0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2473637
Commit-Queue: Anton Bikineev <bikineev@chromium.org>
Reviewed-by: Bartek Nowierski <bartekn@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Cr-Commit-Position: refs/heads/master@{#819429}