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This is one step in moving the overrides files from WebRTC to Chromium. See bug comment #65 for all steps.

Depends on https://codereview.chromium.org/1345873004/ and a WebRTC roll (specifically https://codereview.webrtc.org/1345313004/).

BUG=468375

Review URL: https://codereview.chromium.org/1357913002

Cr-Commit-Position: refs/heads/master@{#351554}