Remove dead code unnecessarily added by r231563 and 236449

ui/base/ime/input_method_ibus.h

Index: ui/base/ime/input_method_ibus.h
diff --git a/ui/base/ime/input_method_ibus.h b/ui/base/ime/input_method_ibus.h
index ef96a070b31ad94856749ce0aa733e9f840bb053..c902805682f44b795cd9828bbb2acd460a19d5e0 100644
--- a/ui/base/ime/input_method_ibus.h
+++ b/ui/base/ime/input_method_ibus.h
@@ -141,9 +141,6 @@ class UI_EXPORT InputMethodIBus
                            uint32 ibus_keyval, uint32 ibus_keycode,
                            uint32 ibus_state, bool is_handled);
 
-  // Processes a caret bounds changed event.
-  void OnCaretBoundsChangedInternal(const TextInputClient* client);
-
   // All pending key events. Note: we do not own these object, we just save
   // pointers to these object so that we can abandon them when necessary.
   // They will be deleted in ProcessKeyEventDone().