https://codereview.chromium.org/1826693002 enables some more Clang warnings which were fixed. Change log:212f976fef..61ed337cfeFull diff:212f976fef..61ed337cfeNo dependencies changed. No update to Clang. TBR= NOTRY=True Review URL: https://codereview.webrtc.org/1896953004 Cr-Commit-Position: refs/heads/master@{#12422}