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Refactor CustomLinksManager unit tests for easier readability

Inline expected Links instead of initializing at the start of the test.

Change-Id: I7077b5f00ddbc712bed603ed55ff8bc7a002b484
Reviewed-on: https://chromium-review.googlesource.com/c/1316431
Commit-Queue: Kristi Park <kristipark@chromium.org>
Reviewed-by: Marc Treib <treib@chromium.org>
Reviewed-by: Ramya Nagarajan <ramyan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#605381}