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This also replaces some uses of small_map::insert with emplace.

Bug: None
Change-Id: I857ca36847eefe7dcc4a7f90d12c0d99ccf2afd8
Reviewed-on: https://chromium-review.googlesource.com/567599
Commit-Queue: Brandon Tolsch <btolsch@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Derek Cheng <imcheng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#486254}