Reland "Revert "audio_processing/aec: make delay estimator aware of starving farend buffer""

Original review at https://codereview.webrtc.org/1180423006

SystemDelayTests was not updated w.r.t. extended_filter mode and some tests were disabled on Android since DA-AEC is automatically set.
All tests have now been updated for both extended_filter mode as well as DA-AEC, hence are now enabled on Android.

Also
* Moves default settings of extended_filter and DA-AEC form Init() to Create() to avoid unintentional loss of state during a reset.
* Fixes a potential bug of starting from scratch in extended_filter mode + DA-AEC.

This reverts commit 01c9b012e9171c813ace9e405c32fc75f4262bf6.

BUG=
R=henrik.lundin@webrtc.org

Review URL: https://codereview.webrtc.org/1187943005.

Cr-Commit-Position: refs/heads/master@{#9458}
3 files changed