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Add some const safety by DCHECK(HasOneRef()) in non-const GetYPlane. This CL also replaces all incorrect non-const calls with const calls for pixel data access in cricket::VideoFrame. It's easy to call the non-const version of e.g. GetYPlane by mistake, even if only const-access is needed. For example: const scoped_ptr<cricket::VideoFrame> foo; const uint8_t* y = foo->GetYPlane(); will actually call the non-const version of GetYPlane. R=mflodman@webrtc.org, perkj@webrtc.org Review URL: https://webrtc-codereview.appspot.com/39079004 Cr-Commit-Position: refs/heads/master@{#8507} git-svn-id: http://webrtc.googlecode.com/svn/trunk@8507 4adac7df-926f-26a2-2b94-8c16560cd09d