Get rid of unused callbacks from ui::InputMethodObserver

ui/base/ime/input_method_observer.h

Index: ui/base/ime/input_method_observer.h
diff --git a/ui/base/ime/input_method_observer.h b/ui/base/ime/input_method_observer.h
index fc517cc46ed9f2d344736dd027d8782521939fb7..9ac177b4d64adee5527a75805e9871cb97f8331e 100644
--- a/ui/base/ime/input_method_observer.h
+++ b/ui/base/ime/input_method_observer.h
@@ -28,19 +28,10 @@ class UI_EXPORT InputMethodObserver {
   // only used by the mock input method for testing.
   virtual void OnBlur() = 0;
 
-  // Called when the focused window receives native IME messages that are not
-  // translated into other predefined event callbacks. Currently this method is
-  // used only for IME testing on Windows.
-  virtual void OnUntranslatedIMEMessage(const base::NativeEvent& event) = 0;
-
   // Called whenever the caret bounds is changed for the input client.
   // Currently only used by the mock input method for testing.
   virtual void OnCaretBoundsChanged(const TextInputClient* client) = 0;
 
-  // Called whenever the input locale is changed for the focused client.
-  // This method is currently used only on Windows and only for testing.
-  virtual void OnInputLocaleChanged() = 0;
-
   // Called when either:
   //  - the TextInputClient is changed (e.g. by a change of focus)
   //  - the TextInputType of the TextInputClient changes