Reason for revert: The change breaks google3 tests for buzz/mediaengines/sae/audio_mixer. Original issue's description: > Remove webrtc::AudioFrame::energy_. > > BUG=webrtc:3315 > > Committed: https://crrev.com/bacae81a1d91ae7b2a4bde37a66ab70513449989 > Cr-Commit-Position: refs/heads/master@{#11372} TBR=kjellander@webrtc.org,henrik.lundin@webrtc.org,tommi@webrtc.org,minyue@webrtc.org # Skipping CQ checks because original CL landed less than 1 days ago. NOPRESUBMIT=true NOTREECHECKS=true NOTRY=true BUG=webrtc:3315 Review URL: https://codereview.webrtc.org/1634143002 Cr-Commit-Position: refs/heads/master@{#11377}