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If we don't, we'll end up crashing if they're enabled when the speech encoder is in the middle of encoding a packet, since CNG and RED assume that the speech encoder starts out with an empty buffer (because they need to be in sync with it). BUG=chromium:490368 Review URL: https://codereview.webrtc.org/1331853002 Cr-Commit-Position: refs/heads/master@{#9917}