Moved debug file handling to aec_core from echo_cancellation.c. This removes dependency on low level member variables.

TEST=audioproc_unittest, trybots
BUG=None

Review URL: https://webrtc-codereview.appspot.com/1093010

git-svn-id: http://webrtc.googlecode.com/svn/trunk@3515 4adac7df-926f-26a2-2b94-8c16560cd09d
2 files changed