Harald Alvestrand 5ad491ec87 Remove call operator from UniqueIdGenerator classes
Call operators do not improve code clarity, and usage was moderate.

Bug: None
Change-Id: I8d86bd7d435ce88e99f4abee8ab95a336d47dc22
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/292960
Reviewed-by: Tomas Gunnarsson <tommi@webrtc.org>
Commit-Queue: Harald Alvestrand <hta@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#39294}
2023-02-10 13:10:35 +00:00
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