Eliminate use if webrtc::VideoFrame::buffer() and ::stride().
Eliminate use if webrtc::VideoFrame::buffer() and ::stride().

Blocks landing of webrtc cl https://codereview.webrtc.org/1900673002/

BUG=webrtc:5682

Review-Url: https://codereview.chromium.org/1924093007
Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#390916}

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