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Worker can legitimately fail to start, this CL clears worker's
PendingTasks when that happens.

In addition to this, this CL makes ServiceWorkerTaskQueue
factory dependent on ProcessManager factory as pending tasks
can call out to ProcessManager
(courtesy of https://crbug.com/1019161#c16) upon
ServiceWorkerTaskQueue's destruction.

This CL adds a test for this ensuring a worker's pending_tasks_
is cleared when start worker failure is seen. The test rejects a
service worker's install event to trigger the failure.

Bug: 1019161
Test: See bug description for repro steps
Change-Id: I384ec0d2830f07fb3b50632ee806e77fd33b7dcb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2103306
Commit-Queue: Istiaque Ahmed <lazyboy@chromium.org>
Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#751925}