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The WorkerTaskProvider's responsibility is now to track existing
profiles and let the PerProfileWorkerTaskTracker track the running
workers and create the tasks.

This avoids keeping track of the ServiceWorkerContext that each
service worker is associated with.

Bug: 1041093
Change-Id: Ie0cd4c7f46c84c2f9a8c96d10afef8440abc63a3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1994178Reviewed-by: Matt Falkenhagen <falken@chromium.org>
Reviewed-by: Ahmed Fakhry <afakhry@chromium.org>
Reviewed-by: Hiroki Nakagawa <nhiroki@chromium.org>
Commit-Queue: Patrick Monette <pmonette@chromium.org>
Cr-Commit-Position: refs/heads/master@{#737682}