Re-lands 58186:

app/keyboard_codes_win.h

 // Copyright (c) 2009 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 BASE_KEYBOARD_CODES_WIN_H_
-#define BASE_KEYBOARD_CODES_WIN_H_
+#ifndef APP_KEYBOARD_CODES_WIN_H_
+#define APP_KEYBOARD_CODES_WIN_H_
 #pragma once
 
 #include <windows.h>
 
-namespace base {
+namespace app {
 
 typedef enum {
   VKEY_BACK = VK_BACK,
   VKEY_TAB = VK_TAB,
   VKEY_CLEAR = VK_CLEAR,
   VKEY_RETURN = VK_RETURN,
   VKEY_SHIFT = VK_SHIFT,
   VKEY_CONTROL = VK_CONTROL,
   VKEY_MENU = VK_MENU,  // a.k.a. ALT
   VKEY_PAUSE = VK_PAUSE,
@@ skipping 152 matching lines @@
   VKEY_EXSEL = VK_EXSEL,
   VKEY_EREOF = VK_EREOF,
   VKEY_PLAY = VK_PLAY,
   VKEY_ZOOM = VK_ZOOM,
   VKEY_NONAME = VK_NONAME,
   VKEY_PA1 = VK_PA1,
   VKEY_OEM_CLEAR = VK_OEM_CLEAR,
   VKEY_UNKNOWN = 0
 } KeyboardCode;
 
-}  // namespace base
+}  // namespace app
 
-#endif  // BASE_KEYBOARD_CODES_WIN_H_
+#endif  // APP_KEYBOARD_CODES_WIN_H_