Removed the unnecessary TODO

ui/base/ime/input_method.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef UI_BASE_IME_INPUT_METHOD_H_
 #define UI_BASE_IME_INPUT_METHOD_H_
 
 #include <string>
 
 #include "base/basictypes.h"
@@ skipping 28 matching lines @@
 //   2) Send VKEY_PROCESSKEY event to the window using the DispatchKeyEvent API,
 //      then update IME status (e.g. composition text) using TextInputClient,
 //      and then send the original key up event to the window.
 // - Keeps track of the focused TextInputClient to see which client can call
 //   APIs, OnTextInputTypeChanged, OnCaretBoundsChanged, and CancelComposition,
 //   that change the state of the input method.
 // In Aura environment, aura::WindowTreeHost creates an instance of
 // ui::InputMethod and owns it.
 class InputMethod {
  public:
-  // TODO(yukawa): Move these typedef into ime_constants.h or somewhere.
+
 #if defined(OS_WIN)
   typedef LRESULT NativeEventResult;
 #else
   typedef int32 NativeEventResult;
 #endif
 
   virtual ~InputMethod() {}
 
   // Sets the delegate used by this InputMethod instance. It should only be
   // called by an object which manages the whole UI.
@@ skipping 98 matching lines @@
   virtual void ShowImeIfNeeded() = 0;
 
   // Management of the observer list.
   virtual void AddObserver(InputMethodObserver* observer) = 0;
   virtual void RemoveObserver(InputMethodObserver* observer) = 0;
 };
 
 }  // namespace ui
 
 #endif  // UI_BASE_IME_INPUT_METHOD_H_