Don't append the bitrate twice to the outgoing bitrate plot in event_log_visualizer.
Don't append the bitrate twice to the outgoing bitrate plot in event_log_visualizer.

Bug: None
Change-Id: I349fb483dcdd5a9574adf810eadd5063145e0cdb
Reviewed-on: https://webrtc-review.googlesource.com/5000
Reviewed-by: Philip Eliasson <729b5e2dca9359bca8c81d600ef9d3e554586ac9@webrtc.org>
Commit-Queue: Björn Terelius <efeae16329b3cb4ac5daf80d4bfda3344c027db3@webrtc.org>
Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#20147}
ShiftMediaProject/libilbc,ShiftMediaProject/libilbc,TimothyGu/libilbc,TimothyGu/libilbc,ShiftMediaProject/libilbc,TimothyGu/libilbc,ShiftMediaProject/libilbc,ShiftMediaProject/libilbc,TimothyGu/libilbc,TimothyGu/libilbc