Change MockStatsObserver to grab values inside of OnComplete. This is done since StatsReportCopyable is going away and the list of supported properties of the mock class is known. StatsReports holds a list of pointers to objects that cannot be cached, so this is a simple way to grab the values when they're available.
Change MockStatsObserver to grab values inside of OnComplete.
This is done since StatsReportCopyable is going away and the list of
supported properties of the mock class is known.
StatsReports holds a list of pointers to objects that cannot be cached,
so this is a simple way to grab the values when they're available.

R=perkj@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/32859004

git-svn-id: a556c8bde68cedbc0208a1ffc78b06e9cd07f676@7932 4adac7df-926f-26a2-2b94-8c16560cd09d

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