Ensure VideoLayersAllocation.frame_rate_fps can not overflow
Ensure VideoLayersAllocation.frame_rate_fps can not overflow

Bug: webrtc:12000
Change-Id: I14d5f0f987fb20bd74e0428b3791bf370476296e
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/204220
Reviewed-by: Erik Språng <3ab8c90c99d6dd7822e0fad803ab0211dd287ae5@webrtc.org>
Commit-Queue: Per Kjellander <ec3efbb37602a1ca89f5fcf018e3a9e25086611a@webrtc.org>
Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#33089}

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