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std::vector<rtcp::TmmbItem> will replace TMMBRSet class for storage, processing and preparing TMBBR/TMMBN (i.e. this TmmbItem replaces Timber structure introduced in https://codereview.webrtc.org/1474693002 ) Previous structures store bitrate in kbps. TmmbItem use bps removing need to regularly divide and multiply by 1000. BUG=webrtc:5260 R=åsapersson Review URL: https://codereview.webrtc.org/1576223003 Cr-Commit-Position: refs/heads/master@{#11491}