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This simplifies the selection code and prepares for moving components
into modules.

Bug: 870055
Change-Id: I7042eb396cb114a74f7e77933f644184d411ce7a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1874610
Commit-Queue: Tibor Goldschwendt <tiborg@chromium.org>
Reviewed-by: Christopher Grant <cjgrant@chromium.org>
Cr-Commit-Position: refs/heads/master@{#709235}