Fixing the build error on Windows. Problem is in coversion from size_t to int.
Fixing the build error on Windows.
Problem is in coversion from size_t to int.

TBR=wu@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/2189004

git-svn-id: a556c8bde68cedbc0208a1ffc78b06e9cd07f676@4698 4adac7df-926f-26a2-2b94-8c16560cd09d

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