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Before this CL, the IntelligibilityEnhancer introduced a processing delay to the lower band, without compensating for it in the higher bands. This CL corrects this. BUG=b/30780909 R=henrik.lundin@webrtc.org, peah@webrtc.org Review URL: https://codereview.webrtc.org/2320833002 . Cr-Commit-Position: refs/heads/master@{#14311}