Add safety checks to base::small_map.

Also use the correct type, size_t, for its size.

Some code cleanup and simplification.

Bug: 817982
Change-Id: I42f4d4230a60d64de8ea483450159c92475e3e4b
Reviewed-on: https://chromium-review.googlesource.com/1157649
Commit-Queue: Chris Palmer <palmer@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#580671}
1 file changed