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Removes duplicate entries in the sources list for feed.

Fix errorprone warnings about wrong argument order in assertEquals.

Tbr: mkwst@chromium.org for trivial reordering of args to assertEquals.
Bug: None
Change-Id: I971385ec599e48c57284acc7bc6eba04cabb8f9d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2099102Reviewed-by: Peter Wen <wnwen@chromium.org>
Commit-Queue: Peter Wen <wnwen@chromium.org>
Auto-Submit: Peter Wen <wnwen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#749365}