Remove NOTIFICATION_EXTENSION_ENABLED.

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 1c5005e265bcbfcee5abb7784c727b8f9c9344b4..2dca7c327556fcd75feef916443ac8d3af505bd7 100644
--- a/chrome/browser/extensions/extension_service.h
+++ b/chrome/browser/extensions/extension_service.h
@@ -587,6 +587,10 @@ class ExtensionService
   // Called when the initial extensions load has completed.
   void OnInstalledExtensionsLoaded();
 
+  // Upon reloading an extension, spins up its lazy background page if
+  // necessary.
+  void MaybeSpinUpLazyBackgroundPage(const extensions::Extension* extension_id);
+
   const base::CommandLine* command_line_ = nullptr;
 
   // The normal profile associated with this ExtensionService.