Revert 7297 "Remove the different block lengths in ns_core"

> Remove the different block lengths in ns_core
> 
> This CL has bit-exact output.
> 
> What it does:
>   * Remove the blockLen10Ms, as it is hardcoded to be equal to blockLen.
>   * This makes outLen to be always zero, so it can be removed too.
>   * It also avoids the need to have an outBuf, because it is not used, so it is also removed
>   * Replaced blockLen10Ms by blockLen everywhere, since they were hardcoded to be equal.
>   * We don't need to check if outLen is zero, because it always is, so it was removed.
>   * Of course, the outBuf needs no initial set or copying around, because it is not used.
> 
> BUG=webrtc:3811
> R=bjornv@webrtc.org, kwiberg@webrtc.org
> 
> Review URL: https://webrtc-codereview.appspot.com/30539004

TBR=aluebs@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/26629004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@7306 4adac7df-926f-26a2-2b94-8c16560cd09d