Enable Service Workers, including the onfetch event, by default.

BUG=364627
TEST=virtual/stable/webexposed

Review URL: https://codereview.chromium.org/680473002

git-svn-id: svn://svn.chromium.org/blink/trunk@184340 bbb929c8-8fbe-4397-9dbb-9b2b20218538

third_party/WebKit/LayoutTests/virtual/stable/webexposed/global-constructors-listing-expected.txt

@@ -390,6 +390,9 @@ Screen
 ScreenOrientation
 ScriptProcessorNode
 Selection
+ServiceWorker
+ServiceWorkerContainer
+ServiceWorkerRegistration
 Set
 ShadowRoot
 SharedWorker

third_party/WebKit/Source/platform/RuntimeEnabledFeatures.in

@@ -112,12 +112,9 @@ ScriptedSpeech status=stable
 ScrollTopLeftInterop status=experimental
 // window.showModalDialog is deprecated and slated for removal. crbug.com/345831
 ShowModalDialog status=deprecated
-ServiceWorker status=experimental
+ServiceWorker status=stable
 ServiceWorkerCache status=experimental
-// FIXME: When ServiceWorker is status=stable add a webexposed test to
-// verify that addEventListener('fetch', ... is *not* fired when
-// onfetch is not enabled.
-ServiceWorkerOnFetch status=experimental
+ServiceWorkerOnFetch status=stable
 SessionStorage status=stable
 SharedWorker status=stable
 SlimmingPaint