b753762ce600dfe314a696769dcf51c3fb1810e4

Noticed lack in tests verifying initial state is not left if we have zero input spectra. This CL adds such a test and change input spectra to const at affected places. BUG=N/A TESTED=trybots and manually R=kwiberg@webrtc.org Review URL: https://webrtc-codereview.appspot.com/15969004 git-svn-id: http://webrtc.googlecode.com/svn/trunk@6631 4adac7df-926f-26a2-2b94-8c16560cd09d
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