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An empty public constructor should be kept for all Fragments, not just
those in Settings. This change also allows us to move settings code
alongside respective feature code (see bug).

Bug: 1047357
Change-Id: I9e776766be4a693622150b58db5e057447118fe2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2036872
Commit-Queue: Natalie Chouinard <chouinard@chromium.org>
Reviewed-by: Sam Maier <smaier@chromium.org>
Cr-Commit-Position: refs/heads/master@{#738265}