Revert 255166 "Cast: Using a min filter to compute time offset"

> Cast: Using a min filter to compute time offset
> 
> Modifying the time offset filter to take to minimum of the first 10 values. 
> Once ten offset values were seen, the value will be constant for the entire session. 
> This may be justified by the fact we are seeking the offset between sender and
>  receiver without accounting the network jitter.
> 
> Review URL: https://codereview.chromium.org/186043003

TBR=mikhal@chromium.org

Review URL: https://codereview.chromium.org/183063011

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@255173 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 255173