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This changes also the names of params from first/second to fst/snd
to avoid confusion with the std::pair members.

Bug: 1153907

Change-Id: I1a9f09b8442f3ed42fb5d02a57fd47b939ed7a4c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2564486Reviewed-by: Joshua Pawlicki <waffles@chromium.org>
Commit-Queue: Sorin Jianu <sorin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#831939}