The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/892b90f7a6b6d7e0494bd639d87dea3096738c5e

commit 892b90f7a6b6d7e0494bd639d87dea3096738c5e
Author: Mugdha Lakhani <nator@chromium.org>
Date: Tue Sep 11 18:01:51 2018

[Background Fetch] Implement BackgroundFetchResult

to align the implementation with the spec.
https://wicg.github.io/background-fetch/#enumdef-backgroundfetchresult

This change also gets rid of BackgroundFetchState.

Bug:  881871 ,  873630 
Change-Id: I2be6087fdb68a4463872013b834611727ff525e6
Reviewed-on: https://chromium-review.googlesource.com/1213508
Reviewed-by: Nasko Oskov <nasko@chromium.org>
Reviewed-by: Rayan Kanso <rayankans@chromium.org>
Reviewed-by: Peter Beverloo <peter@chromium.org>
Commit-Queue: Mugdha Lakhani <nator@chromium.org>
Cr-Commit-Position: refs/heads/master@{#590395}
[modify] https://crrev.com/892b90f7a6b6d7e0494bd639d87dea3096738c5e/content/browser/background_fetch/background_fetch.proto
[modify] https://crrev.com/892b90f7a6b6d7e0494bd639d87dea3096738c5e/content/browser/background_fetch/background_fetch_context.cc
[modify] https://crrev.com/892b90f7a6b6d7e0494bd639d87dea3096738c5e/content/browser/background_fetch/background_fetch_context.h
[modify] https://crrev.com/892b90f7a6b6d7e0494bd639d87dea3096738c5e/content/browser/background_fetch/background_fetch_event_dispatcher_unittest.cc
[modify] https://crrev.com/892b90f7a6b6d7e0494bd639d87dea3096738c5e/content/browser/background_fetch/background_fetch_job_controller.cc
[modify] https://crrev.com/892b90f7a6b6d7e0494bd639d87dea3096738c5e/content/browser/background_fetch/background_fetch_job_controller.h
[modify] https://crrev.com/892b90f7a6b6d7e0494bd639d87dea3096738c5e/content/browser/background_fetch/background_fetch_test_base.cc
[modify] https://crrev.com/892b90f7a6b6d7e0494bd639d87dea3096738c5e/content/browser/background_fetch/background_fetch_test_base.h
[modify] https://crrev.com/892b90f7a6b6d7e0494bd639d87dea3096738c5e/content/browser/background_fetch/storage/create_metadata_task.cc
[modify] https://crrev.com/892b90f7a6b6d7e0494bd639d87dea3096738c5e/content/browser/background_fetch/storage/database_helpers.cc
[modify] https://crrev.com/892b90f7a6b6d7e0494bd639d87dea3096738c5e/content/common/background_fetch/background_fetch_struct_traits.cc
[modify] https://crrev.com/892b90f7a6b6d7e0494bd639d87dea3096738c5e/content/common/background_fetch/background_fetch_struct_traits.h
[modify] https://crrev.com/892b90f7a6b6d7e0494bd639d87dea3096738c5e/content/common/background_fetch/background_fetch_struct_traits_unittest.cc
[modify] https://crrev.com/892b90f7a6b6d7e0494bd639d87dea3096738c5e/content/common/background_fetch/background_fetch_types.cc
[modify] https://crrev.com/892b90f7a6b6d7e0494bd639d87dea3096738c5e/content/common/background_fetch/background_fetch_types.h
[modify] https://crrev.com/892b90f7a6b6d7e0494bd639d87dea3096738c5e/content/renderer/service_worker/service_worker_context_client.cc
[modify] https://crrev.com/892b90f7a6b6d7e0494bd639d87dea3096738c5e/third_party/WebKit/LayoutTests/external/wpt/background-fetch/fetch.https.window.js
[modify] https://crrev.com/892b90f7a6b6d7e0494bd639d87dea3096738c5e/third_party/WebKit/LayoutTests/external/wpt/background-fetch/get.https.window.js
[modify] https://crrev.com/892b90f7a6b6d7e0494bd639d87dea3096738c5e/third_party/WebKit/LayoutTests/external/wpt/background-fetch/idlharness.https.any-expected.txt
[modify] https://crrev.com/892b90f7a6b6d7e0494bd639d87dea3096738c5e/third_party/WebKit/LayoutTests/external/wpt/background-fetch/idlharness.https.any.serviceworker-expected.txt
[modify] https://crrev.com/892b90f7a6b6d7e0494bd639d87dea3096738c5e/third_party/WebKit/LayoutTests/external/wpt/background-fetch/idlharness.https.any.sharedworker-expected.txt
[modify] https://crrev.com/892b90f7a6b6d7e0494bd639d87dea3096738c5e/third_party/WebKit/LayoutTests/external/wpt/background-fetch/idlharness.https.any.worker-expected.txt
[modify] https://crrev.com/892b90f7a6b6d7e0494bd639d87dea3096738c5e/third_party/WebKit/LayoutTests/http/tests/serviceworker/webexposed/global-interface-listing-service-worker-expected.txt
[modify] https://crrev.com/892b90f7a6b6d7e0494bd639d87dea3096738c5e/third_party/WebKit/LayoutTests/webexposed/global-interface-listing-dedicated-worker-expected.txt
[modify] https://crrev.com/892b90f7a6b6d7e0494bd639d87dea3096738c5e/third_party/WebKit/LayoutTests/webexposed/global-interface-listing-expected.txt
[modify] https://crrev.com/892b90f7a6b6d7e0494bd639d87dea3096738c5e/third_party/WebKit/LayoutTests/webexposed/global-interface-listing-shared-worker-expected.txt
[modify] https://crrev.com/892b90f7a6b6d7e0494bd639d87dea3096738c5e/third_party/blink/public/platform/modules/background_fetch/background_fetch.mojom
[modify] https://crrev.com/892b90f7a6b6d7e0494bd639d87dea3096738c5e/third_party/blink/public/platform/modules/background_fetch/web_background_fetch_registration.h
[modify] https://crrev.com/892b90f7a6b6d7e0494bd639d87dea3096738c5e/third_party/blink/renderer/modules/background_fetch/background_fetch_bridge.cc
[modify] https://crrev.com/892b90f7a6b6d7e0494bd639d87dea3096738c5e/third_party/blink/renderer/modules/background_fetch/background_fetch_registration.cc
[modify] https://crrev.com/892b90f7a6b6d7e0494bd639d87dea3096738c5e/third_party/blink/renderer/modules/background_fetch/background_fetch_registration.h
[modify] https://crrev.com/892b90f7a6b6d7e0494bd639d87dea3096738c5e/third_party/blink/renderer/modules/background_fetch/background_fetch_registration.idl
[modify] https://crrev.com/892b90f7a6b6d7e0494bd639d87dea3096738c5e/third_party/blink/renderer/modules/background_fetch/background_fetch_type_converters.cc