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size_t is more appropriate for array lengths, since int might theoretically be too small for a really large array. But more importantly, if the caller's value is naturally of type size_t and the function requires an int, VC++ will trigger warning C4267 (http://msdn.microsoft.com/en-us/library/6kck0s93.aspx) because the implicit cast might be lossy, forcing the caller to do a manual cast. Typing the function with size_t in the first place resolves the problem. R=aluebs@webrtc.org, andrew@webrtc.org, minyue@webrtc.org Review URL: https://webrtc-codereview.appspot.com/21909004 git-svn-id: http://webrtc.googlecode.com/svn/trunk@6702 4adac7df-926f-26a2-2b94-8c16560cd09d