Follow-up CL for r3007.

Fixes an initialization issue introduced with r3007 and adds a test for
detecting problems with reordering. Also some cleanup for better code.

TEST=remote_bitrate_estimator_unittests

BUG=1009

Review URL: https://webrtc-codereview.appspot.com/937007

git-svn-id: http://webrtc.googlecode.com/svn/trunk/webrtc@3014 4adac7df-926f-26a2-2b94-8c16560cd09d
3 files changed