2dd6a270c0eb9f540427537b03330d0ed6824f9d

Purely cosmetic changes: 1. virtual => override 2. NULL => nullptr 3. data member name: underscore prefix => suffix 4. clang format R=kwiberg@webrtc.org Review URL: https://webrtc-codereview.appspot.com/49669004 Cr-Commit-Position: refs/heads/master@{#8997}
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