Revert "Using safe casts of allocation limits in Call."
Revert "Using safe casts of allocation limits in Call."

This reverts commit 4a9b4d6332f596867d2a8fb34ff5b4befb9848eb.

Reason for revert: Breaks downstream projects

Original change's description:
> Using safe casts of allocation limits in Call.
> 
> Bug: None
> Change-Id: I71d0e1f92bf820d117b354dd7701c9c719cc2c0a
> Reviewed-on: https://webrtc-review.googlesource.com/61784
> Commit-Queue: Sebastian Jansson <srte@webrtc.org>
> Reviewed-by: Niels Moller <nisse@webrtc.org>
> Cr-Commit-Position: refs/heads/master@{#22490}

TBR=nisse@webrtc.org,srte@webrtc.org

Change-Id: I720e97981574fd152cb7ed4204e29f9ea0b2e909
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: None
Reviewed-on: https://webrtc-review.googlesource.com/62920
Reviewed-by: Oleh Prypin <5baa3e04f9bd6ba7a2a4b56625a3c84f19237cdb@webrtc.org>
Commit-Queue: Oleh Prypin <5baa3e04f9bd6ba7a2a4b56625a3c84f19237cdb@webrtc.org>
Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#22491}
TimothyGu/libilbc,TimothyGu/libilbc,TimothyGu/libilbc,ShiftMediaProject/libilbc,ShiftMediaProject/libilbc,ShiftMediaProject/libilbc,ShiftMediaProject/libilbc,TimothyGu/libilbc,ShiftMediaProject/libilbc,TimothyGu/libilbc