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When initiating a call default audio options are applied, which turns on platform-AEC if such exists. Then, if delay agnostic AEC (DA-AEC) is enabled through a media constraint no action with respect to platform-AEC is taken (a bug) and turning on SW AEC. Hence, we run both AECs. This CL makes sure the platform-AEC is disabled if we want to run DA-AEC. BUG= TESTED=locally on Nexus 4 and Nexus 6. R=henrika@webrtc.org, tommi@webrtc.org Review URL: https://webrtc-codereview.appspot.com/52049004 Cr-Commit-Position: refs/heads/master@{#9361}