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Before, we did direct story_set manipulation. This is a bad pattern however
per crbug.com/980758 and we would prefer to delete that functionality.

Note that
this problem could have been solved instead by passing
--run-full-story-set into options_for_unittests, but then we would not
be removing the usage of RemoveStory, and we would not be running the
abridged stories as the smoke tests.

Bug: 980758, 965158
Change-Id: I027783d0920409df2d645b7fe8f6c26392aee3fc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1874821Reviewed-by: Juan Antonio Navarro Pérez <perezju@chromium.org>
Commit-Queue: Caleb Rouleau <crouleau@chromium.org>
Cr-Commit-Position: refs/heads/master@{#709239}