Remove unneeded *_NOT_SUPPORTED from VoEAudioProcessing.

* Remove ANDROID_NOT_SUPPORTED from a bunch of echo metrics calls
where it actually is supported.
* No error to call GetTypingDetectionStatus.
* Consolidate typing detection disablement to reduce boilerplate.

R=niklas.enbom@webrtc.org, xians@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/1683004

git-svn-id: http://webrtc.googlecode.com/svn/trunk/webrtc@4247 4adac7df-926f-26a2-2b94-8c16560cd09d
3 files changed