Remove NOTIFICATION_EXTENSION_ENABLED.

chrome/browser/extensions/api/input_ime/input_ime_api.h

Index: chrome/browser/extensions/api/input_ime/input_ime_api.h
diff --git a/chrome/browser/extensions/api/input_ime/input_ime_api.h b/chrome/browser/extensions/api/input_ime/input_ime_api.h
index 21ed2f8294b5de78710c39815174ab8cd9e28529..5cc78e45b772263e58b476ff824bb9255966f683 100644
--- a/chrome/browser/extensions/api/input_ime/input_ime_api.h
+++ b/chrome/browser/extensions/api/input_ime/input_ime_api.h
@@ -18,6 +18,7 @@
 #include "chrome/browser/ui/input_method/input_method_engine_base.h"
 #include "components/keyed_service/core/keyed_service.h"
 #include "content/public/browser/notification_observer.h"
+#include "content/public/browser/notification_registrar.h"

[lazyboy, 2017/05/17 18:14:48]

This was transitively being included through EventRouter.

 #include "extensions/browser/browser_context_keyed_api_factory.h"
 #include "extensions/browser/event_router.h"
 #include "extensions/browser/extension_function.h"
@@ -34,10 +35,6 @@
 
 class Profile;
 
-namespace content {
-class NotificationRegistrar;
-}
-
 namespace ui {
 class IMEEngineHandlerInterface;