Removed the timeout for the delay estimate quality.

BUG=webrtc:8223, chromium:763761

Review-Url: https://codereview.webrtc.org/3011193002
Cr-Original-Commit-Position: refs/heads/master@{#19773}
Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: c6b1041d6782ca3a483ac72f42c85375230a48c8