This bug fixes an issue introduced in https://codereview.webrtc.org/1396073003/ BUG=webrtc:5067 TEST= set new_bit_rate = 200 in MediaCodecVideoEncoder::SetRatesOnCodecThread and compile and run ApprtDemo R=magjed@webrtc.org Review URL: https://codereview.webrtc.org/1401943002 . Cr-Commit-Position: refs/heads/master@{#10263}