Service Worker: Add missing ServiceWorkerDispatcherHost::SendUpdateError.

Add ServiceWorkerDispatcherHost::SendUpdateError method as a follow-up patch for
https://codereview.chromium.org/1270513002/.

While working on the layout test, itt has been found that
ServiceWorkerDispatcherHost::UpdateComplete was calling
ServiceWorkerDispatcherHost::SendRegistrationError instead of the missing
ServiceWorkerDispatcherHost::SendUpdateError so the callback in the
renderer-side could not be properly located.

Related CL: https://codereview.chromium.org/1270513002/

BUG=513655

Review URL: https://codereview.chromium.org/1278713002

Cr-Commit-Position: refs/heads/master@{#342091}
2 files changed