Add minor fixes to video_capture_ios.mm in order to make it more robust.
Add minor fixes to video_capture_ios.mm in order to make it more robust.

R=tkchin@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/46429005

Patch from Iurii Shevchuk <youwrk@gmail.com>.

git-svn-id: 03ae4fbe531b1eefc9d815f31e49022782c42458@8763 4adac7df-926f-26a2-2b94-8c16560cd09d

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