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binary tree. std::vector followed by std::sort and std::unique is a
cheaper operation that saves a lot of RAM. Zucchini-read approximately
halves in memory consumption (binary dependent) as a result of this
change.

std: :set is expensive in 64 bit binaries as it uses pointers to store a
Change-Id: Ib7dd8242f8629ba436943695aa8ed3c3b8803ee4
Reviewed-on: https://chromium-review.googlesource.com/951753
Commit-Queue: Calder Kitagawa <ckitagawa@google.com>
Reviewed-by: Samuel Huang <huangs@chromium.org>
Cr-Commit-Position: refs/heads/master@{#541526}