Re-lands 58186:

app/keyboard_codes_win.h

Index: app/keyboard_codes_win.h
diff --git a/base/keyboard_codes_win.h b/app/keyboard_codes_win.h
similarity index 96%
rename from base/keyboard_codes_win.h
rename to app/keyboard_codes_win.h
index 58939476c0a842a61e4ecc57212611c527658156..7c76dfd540e74ba135a6c9dedf2d50bfdbacea17 100644
--- a/base/keyboard_codes_win.h
+++ b/app/keyboard_codes_win.h
@@ -2,13 +2,13 @@
 // 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,
@@ -181,6 +181,6 @@ typedef enum {
   VKEY_UNKNOWN = 0
 } KeyboardCode;
 
-}  // namespace base
+}  // namespace app
 
-#endif  // BASE_KEYBOARD_CODES_WIN_H_
+#endif  // APP_KEYBOARD_CODES_WIN_H_