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@3014 4adac7df-926f-26a2-2b94-8c16560cd09d