Niels Möller bc93575749 Delete unused class PairHash
Partial revert of
https://webrtc-review.googlesource.com/c/src/+/216243, this class is
no longer needed, after
https://webrtc-review.googlesource.com/c/src/+/229182 replaced usage
of unordered_map with flat_map.

Bug: webrtc:12689
Change-Id: I56e4d9326334b78eb09d471ded752e58601f4abf
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/231235
Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org>
Reviewed-by: Victor Boivie <boivie@webrtc.org>
Commit-Queue: Niels Moller <nisse@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#34941}
2021-09-07 15:05:00 +00:00
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