Remove WM_DEADCHAR/WM_SYSDEADCHAR handler

ui/base/ime/input_method_win.h

 // Copyright (c) 2011 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_WIN_H_
 #define UI_BASE_IME_INPUT_METHOD_WIN_H_
 
 #include <windows.h>
 
 #include <string>
@@ skipping 31 matching lines @@
   LRESULT OnImeRequest(UINT message,
                        WPARAM wparam,
                        LPARAM lparam,
                        BOOL* handled);
   // For both WM_CHAR and WM_SYSCHAR
   LRESULT OnChar(HWND window_handle,
                  UINT message,
                  WPARAM wparam,
                  LPARAM lparam,
                  BOOL* handled);
-  // For both WM_DEADCHAR and WM_SYSDEADCHAR
-  // TODO(yukawa): Stop handling WM_DEADCHAR and WM_SYSDEADCHAR when non-Aura
-  // build is deprecated.
-  LRESULT OnDeadChar(UINT message, WPARAM wparam, LPARAM lparam, BOOL* handled);
 
   LRESULT OnDocumentFeed(RECONVERTSTRING* reconv);
   LRESULT OnReconvertString(RECONVERTSTRING* reconv);
   LRESULT OnQueryCharPosition(IMECHARPOSITION* char_positon);
 
   // Returns the window handle to which |text_input_client| is bound.
   // On Aura environment, |toplevel_window_handle_| is always returned.
   HWND GetAttachedWindowHandle(const TextInputClient* text_input_client) const;
 
   // Returns true if the Win32 native window bound to |client| is considered
@@ skipping 27 matching lines @@
   // workaround against crbug.com/319100
   // TODO(yukawa, IME): Figure out long-term solution.
   bool accept_carriage_return_;
 
   DISALLOW_COPY_AND_ASSIGN(InputMethodWin);
 };
 
 }  // namespace ui
 
 #endif  // UI_BASE_IME_INPUT_METHOD_WIN_H_