Revert of [Extensions] Migrate ServiceWorker off behavior feature system

extensions/renderer/dispatcher.h

Index: extensions/renderer/dispatcher.h
diff --git a/extensions/renderer/dispatcher.h b/extensions/renderer/dispatcher.h
index 434dcde3cdbd745d0f7d387e6660f71cd9bc0cde..09cb0d44e691c6ee8b1e72990ef5f2dfd1541b68 100644
--- a/extensions/renderer/dispatcher.h
+++ b/extensions/renderer/dispatcher.h
@@ -246,6 +246,9 @@
   // |context|.
   void RequireGuestViewModules(ScriptContext* context);
 
+  // Adds features that are specific to the current channel.
+  void AddChannelSpecificFeatures();
+
   // The delegate for this dispatcher. Not owned, but must extend beyond the
   // Dispatcher's own lifetime.
   DispatcherDelegate* delegate_;