Simplify interface of ServiceWorkerVersion::RunAfterStartWorker

This CL modifies the interface of RunAfterStartWorker to take only
one StatusCallback instead of a task closure and an error callback.

Bug: 730593
Change-Id: I4e6578e439a8e96f86869e8737ec62e8e155cf36
Reviewed-on: https://chromium-review.googlesource.com/846139
Commit-Queue: Yannic Bonenberger <[email protected]>
Reviewed-by: Matt Falkenhagen <[email protected]>
Reviewed-by: Kinuko Yasuda <[email protected]>
Cr-Commit-Position: refs/heads/master@{#528915}
21 files changed