Revert 5184 "Small refactoring change in delay_estimator."
Revert 5184 "Small refactoring change in delay_estimator."

> Small refactoring change in delay_estimator.
> 
> This CL produce the bit exact output and is a preparing step for an upcoming robust validation scheme.
> 
> TESTED=trybots, module_unittest
> BUG=None
> R=aluebs@webrtc.org
> 
> Review URL: https://webrtc-codereview.appspot.com/4549004

TBR=bjornv@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/4589004

git-svn-id: 03ae4fbe531b1eefc9d815f31e49022782c42458@5185 4adac7df-926f-26a2-2b94-8c16560cd09d

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