Remove leaking aecdump testfiles.

Also removes tracing to file in ApmTest because it leads to remaining
files.

BUG=4258
R=bjornv@webrtc.org, kjellander@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/52469004

Cr-Commit-Position: refs/heads/master@{#9175}
1 file changed