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Previously, test placeholders were extracted from test_locations_, a std::map,
which implicitly deduplicated the keys. After creating test_placeholders_, I
stored them in a vector. Unfortunately, this causes duplicate entries to occur
when iterations > 1. Storing them in a set returns the previous behavior.

Bug: 934996
Change-Id: I81825b1f95064ac59594b3531cfd8409c631e8f8
Reviewed-on: https://chromium-review.googlesource.com/c/1484074Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: Erik Chen <erikchen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#634868}