Use unique filenames in AudioProcessingTests for parallelization.

TBR=bjornv
TESTED="gtest-parallel -w 32 --gtest_filter=*AudioProcessingTests*
out/Debug/modules_unittests" passes.

Review URL: https://webrtc-codereview.appspot.com/14369004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@5968 4adac7df-926f-26a2-2b94-8c16560cd09d
1 file changed