Remove the 2-level input method system & InputMethodBridge.

ui/aura/window.h

Index: ui/aura/window.h
diff --git a/ui/aura/window.h b/ui/aura/window.h
index 0a82a023edd74fc22ffb74d516c736bd9f51df80..f2423736da337c8e567adb52fc9d4fcad1c97078 100644
--- a/ui/aura/window.h
+++ b/ui/aura/window.h
@@ -218,10 +218,6 @@ class AURA_EXPORT Window : public ui::LayerDelegate,
                                   const Window* target,
                                   gfx::Rect* rect);
 
-  // Returns the focused text input client within this window.
-  // This function does not look at child windows.
-  ui::TextInputClient* GetFocusedTextInputClient();
-
   // Moves the cursor to the specified location relative to the window.
   void MoveCursorTo(const gfx::Point& point_in_window);