GitLab

WorkerTaskRunner manages and uses the WebWorkerRunLoops in a map in |loop_map_|,
and |run_loop_| in ThreadLocalState remain unused. So remove it.

BUG=none
R=avi@chromium.org

Review URL: https://codereview.chromium.org/880213002

Cr-Commit-Position: refs/heads/master@{#313519}