Remove redundant request ids passed when dispatching PaymentRequest events

ServiceWorkerEventDispatcher methods for dispatching events take
|event_id| or |payment_request_id| but it's not used.

Bug: 802974
Change-Id: Ie79e17716d5c6916b8df125e17a886da2abac0d0
Reviewed-on: https://chromium-review.googlesource.com/1071315
Reviewed-by: Makoto Shimazu <[email protected]>
Reviewed-by: Kinuko Yasuda <[email protected]>
Commit-Queue: Kinuko Yasuda <[email protected]>
Cr-Commit-Position: refs/heads/master@{#562226}
5 files changed