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Now that the Rent-A-Codec no longer owns the encoders and decoders it produces, they may outlive it. It's thus no longer correct for the Rent-A-Codec to own the bandwidth estimation state; all of the involved objects need to share ownership. BUG=webrtc:5028 Review URL: https://codereview.webrtc.org/1821513003 Cr-Commit-Position: refs/heads/master@{#12159}