Remove PayloadRouter dependency from ViEEncoder.

BUG=webrtc:5687

Review-Url: https://codereview.webrtc.org/1912653002
Cr-Original-Commit-Position: refs/heads/master@{#12593}
Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: bc75d97c32ec8149e9f2e4e03d16933c771f7347
10 files changed