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content/ already depends on components/variations in multiple places;
see the bug for more details.

This will also eliminate the need to add additional variations-related
dependencies in content/renderer/DEPS and content/browser/DEPS, e.g.
https://chromium-review.googlesource.com/c/chromium/src/+/2411489/2.

Bug: 1129078
Change-Id: Id9c8ddef40e70671d4e42ef0b24cdb6239be2f5a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2414842
Commit-Queue: Caitlin Fischer <caitlinfischer@google.com>
Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Cr-Commit-Position: refs/heads/master@{#807885}