The unit test ConversationalSpeechTest.MultiEndCallWavReaderAdaptorSine uses CreateSineWavFile() and writes temporary wav files that are used for test (deleted only if the test passes). BUG=webrtc:7218 Review-Url: https://codereview.webrtc.org/2774423005 Cr-Commit-Position: refs/heads/master@{#17608}