The Chrome clang plugin currently skips all of third_party/WebKit. While there's a flag to check WebKit as well, it's an all-or-nothing affair.
In the long run, we may want to enable all the plugin checks in Blink anyway, but we should have an incremental path for enabling the most valuable checks: `auto' is qualified as appropriate, override/final are used as needed, and possibly a couple others.
Comment 1 by dcheng@chromium.org
, Mar 30 2017