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This will make them easier to work with when used in collections

Change-Id: I8225afc3076929c9d8c162ca2a4af30c390e7fd6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2425400
Commit-Queue: John Wu <jzw@chromium.org>
Reviewed-by: Hiroshi Ichikawa <ichikawa@chromium.org>
Cr-Commit-Position: refs/heads/master@{#810253}