Clean up useless code in InputMethodManagerImpl.

chrome/browser/chromeos/input_method/input_method_manager_impl.h

Index: chrome/browser/chromeos/input_method/input_method_manager_impl.h
diff --git a/chrome/browser/chromeos/input_method/input_method_manager_impl.h b/chrome/browser/chromeos/input_method/input_method_manager_impl.h
index a8b1b0a94555c3e6eff708ee65830e0a8145217a..b245c4300a614153c60275ea5674f2559b3d6212 100644
--- a/chrome/browser/chromeos/input_method/input_method_manager_impl.h
+++ b/chrome/browser/chromeos/input_method/input_method_manager_impl.h
@@ -203,10 +203,6 @@ class InputMethodManagerImpl : public InputMethodManager,
   // auto-repeat interval.
   scoped_ptr<ImeKeyboard> keyboard_;
 
-  base::ThreadChecker thread_checker_;
-
-  base::WeakPtrFactory<InputMethodManagerImpl> weak_ptr_factory_;
-
   // The engine map from extension_id to an engine.
   std::map<std::string, InputMethodEngineInterface*> engine_map_;