Fix OWNERS file name in src/tracing

TBR=yangguo@chromium.org
NOTRY=true

Change-Id: I5fa467a37d654c6e7254f429b7b2f662a77b2901
Reviewed-on: https://chromium-review.googlesource.com/c/1403017Reviewed-by: Yang Guo <yangguo@chromium.org>
Reviewed-by: Alexei Filippov <alph@chromium.org>
Commit-Queue: Alexei Filippov <alph@chromium.org>
Cr-Commit-Position: refs/heads/master@{#58684}