Remove AudioEncoder methods SetMaxBitrate and SetMaxPayloadSize

And the corresponding ACM methods SetISACMaxRate and
SetISACMaxPayloadSize. They were only used in tests.

Review URL: https://codereview.webrtc.org/1311533010

Cr-Original-Commit-Position: refs/heads/master@{#9903}
Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: c99ebc1490ec689f5932d7731a215ca02ab30af6
13 files changed