Reland of [Extensions] Migrate ServiceWorker off behavior feature system

extensions/renderer/dispatcher.cc

Index: extensions/renderer/dispatcher.cc
diff --git a/extensions/renderer/dispatcher.cc b/extensions/renderer/dispatcher.cc
index fa73ccc26163ac80378e6e857fc7ce98d3ae55ae..7f3a28f9c9eb59daa8517ec2869169e4885d5aa7 100644
--- a/extensions/renderer/dispatcher.cc
+++ b/extensions/renderer/dispatcher.cc
@@ -1069,7 +1069,6 @@
 
 void Dispatcher::OnSetChannel(int channel) {
   delegate_->SetChannel(channel);
-  AddChannelSpecificFeatures();
 }
 
 void Dispatcher::OnSetScriptingWhitelist(
@@ -1600,13 +1599,4 @@
   }
 }
 
-void Dispatcher::AddChannelSpecificFeatures() {
-  // chrome-extension: resources should be allowed to register a Service Worker.
-  if (FeatureProvider::GetBehaviorFeature(BehaviorFeature::kServiceWorker)
-          ->IsAvailableToEnvironment()
-          .is_available())
-    WebSecurityPolicy::registerURLSchemeAsAllowingServiceWorkers(
-        WebString::fromUTF8(kExtensionScheme));
-}
-
 }  // namespace extensions