Mark virtual/threaded/inspector/tracing/worker-js-frames.html as flaky
Mark virtual/threaded/inspector/tracing/worker-js-frames.html as flaky

BUG=420008
TBR=caseq
NOTRY=true

Review URL: https://codereview.chromium.org/1648003002 .

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#372122}

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