Replace all Verify* methods with matchers for VideoStreamEncoder
Replace all Verify* methods with matchers for VideoStreamEncoder

This is a follow up to
https://webrtc-review.googlesource.com/c/src/+/175912
to replcae the wants comparisons as well.

R=76788ac3efd229e9d156135d9ceb7fef65c45da4@webrtc.org

Bug: None
Change-Id: Ic11c7fe62ceead643932f02a3287d6bed9160be3
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/175915
Reviewed-by: Ilya Nikolaevskiy <76788ac3efd229e9d156135d9ceb7fef65c45da4@webrtc.org>
Commit-Queue: Evan Shrubsole <7a4ae6b96648f94a29a5ec4b2747fe0ea094fcde@google.com>
Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#31346}

TimothyGu/libilbc,ShiftMediaProject/libilbc,TimothyGu/libilbc,ShiftMediaProject/libilbc,ShiftMediaProject/libilbc,ShiftMediaProject/libilbc,ShiftMediaProject/libilbc,TimothyGu/libilbc,TimothyGu/libilbc,TimothyGu/libilbc