Makes sure that an input method doesn't reference to a destroyed object.

ui/base/ime/fake_input_method.h

Index: ui/base/ime/fake_input_method.h
diff --git a/ui/base/ime/fake_input_method.h b/ui/base/ime/fake_input_method.h
index e80d2bcbab1d1baec114a94386bd2f937cba0dc3..9aca97c4e47e6cc886a425846b31be0db4841221 100644
--- a/ui/base/ime/fake_input_method.h
+++ b/ui/base/ime/fake_input_method.h
@@ -34,6 +34,7 @@ class UI_EXPORT FakeInputMethod : NON_EXPORTED_BASE(public InputMethod) {
   virtual bool OnUntranslatedIMEMessage(const base::NativeEvent& event,
                                         NativeEventResult* result) OVERRIDE;
   virtual void SetFocusedTextInputClient(TextInputClient* client) OVERRIDE;
+  virtual void DetachTextInputClient(TextInputClient* client) OVERRIDE;
   virtual TextInputClient* GetTextInputClient() const OVERRIDE;
   virtual bool DispatchKeyEvent(const base::NativeEvent& native_event) OVERRIDE;
   virtual bool DispatchFabricatedKeyEvent(const ui::KeyEvent& event) OVERRIDE;