Revert of [Extensions] Ensure ordering of extension [un]loaded, activated messages

chrome/browser/extensions/extension_service.h

Index: chrome/browser/extensions/extension_service.h
diff --git a/chrome/browser/extensions/extension_service.h b/chrome/browser/extensions/extension_service.h
index f9e143690694db4f694a2d3b986bcd080bde720f..556cc4f388d1cf775eb14147623418b4c4d5afd5 100644
--- a/chrome/browser/extensions/extension_service.h
+++ b/chrome/browser/extensions/extension_service.h
@@ -65,7 +65,6 @@
 class ExtensionUpdater;
 class ExternalInstallManager;
 class OneShotEvent;
-class RendererStartupHelper;
 class SharedModuleService;
 class UpdateObserver;
 }  // namespace extensions
@@ -712,10 +711,6 @@
   // The SharedModuleService used to check for import dependencies.
   std::unique_ptr<extensions::SharedModuleService> shared_module_service_;
 
-  // The associated RendererStartupHelper. Guaranteed to outlive the
-  // ExtensionSystem, and thus us.
-  extensions::RendererStartupHelper* renderer_helper_;
-
   base::ObserverList<extensions::UpdateObserver, true> update_observers_;
 
   // Migrates app data when upgrading a legacy packaged app to a platform app