Revert "Disable some service-worker and a fetch test with the network service."

This reverts commit d6bb2dcc.

Reason for revert: offending CL reverted: https://chromium-review.googlesource.com/c/chromium/src/+/1050847

Original change's description:
> Disable some service-worker and a fetch test with the network service.
> 
> I believe these most likely broken by
> https://chromium-review.googlesource.com/1048133
> 
> TBR=japhet@chromium.org, jam@chromium.org
> NOTRY=true
> 
> Bug: 729848, 706331
> Cq-Include-Trybots: master.tryserver.chromium.linux:linux_mojo
> Change-Id: I4b3525af8d2f06fbccf311e40a9f64e7af70ffcd
> Reviewed-on: https://chromium-review.googlesource.com/1049831
> Commit-Queue: Matt Menke <mmenke@chromium.org>
> Reviewed-by: John Abd-El-Malek <jam@chromium.org>
> Reviewed-by: Matt Menke <mmenke@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#556972}

TBR=falken@chromium.org,jam@chromium.org,japhet@chromium.org,mmenke@chromium.org

Change-Id: Ib6b665dba5810a5c50f2c7081a0647bcd22e58bc
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 729848, 706331
Cq-Include-Trybots: master.tryserver.chromium.linux:linux_mojo
Reviewed-on: https://chromium-review.googlesource.com/1050500Reviewed-by: Nate Chapin <japhet@chromium.org>
Commit-Queue: Nate Chapin <japhet@chromium.org>
Cr-Commit-Position: refs/heads/master@{#557001}

third_party/WebKit/LayoutTests/FlagExpectations/enable-features=NetworkService

@@ -45,12 +45,3 @@ crbug.com/792546 external/wpt/fetch/corb/img-mime-types-coverage.tentative.sub.h
 crbug.com/792546 external/wpt/fetch/corb/img-png-mislabeled-as-html-nosniff.tentative.sub.html [ Failure ]
 crbug.com/792546 external/wpt/fetch/corb/preload-image-png-mislabeled-as-html-nosniff.tentative.sub.html [ Failure ]
 crbug.com/792546 external/wpt/fetch/corb/script-html-correctly-labeled.tentative.sub.html [ Failure ]
-
-# First regressed in https://ci.chromium.org/buildbot/chromium.fyi/Mojo%20Linux/13077
-# Suspected CL: https://chromium-review.googlesource.com/1048133
-Bug(none) external/wpt/fetch/api/request/destination/fetch-destination-no-load-event.https.html [ Timeout ]
-Bug(none) external/wpt/service-workers/service-worker/import-scripts-redirect.https.html [ Timeout ]
-Bug(none) external/wpt/service-workers/service-worker/import-scripts-resource-map.https.html [ Timeout ]
-Bug(none) external/wpt/service-workers/service-worker/registration-updateviacache.https.html [ Timeout ]
-Bug(none) external/wpt/service-workers/service-worker/shared-worker-controlled.https.html [ Timeout ]
-Bug(none) external/wpt/service-workers/service-worker/worker-interception-redirect.https.html [ Timeout ]