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Revert CL: https://codereview.webrtc.org/2456333002/, commit 48dfab5c58119a4e65c52506ed55f8de79725bcf. The new function on the APM interface is no longer pure virtual. BUG=webrtc:6525 TBR=solenberg@webrtc.org,peah@webrtc.org Review-Url: https://codereview.webrtc.org/2458993002 Cr-Commit-Position: refs/heads/master@{#14827}