Stop using "+chromeos(...)" in an XKB layout name.

chrome/browser/chromeos/input_method/mock_xkeyboard.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 CHROME_BROWSER_CHROMEOS_INPUT_METHOD_MOCK_XKEYBOARD_H_
 #define CHROME_BROWSER_CHROMEOS_INPUT_METHOD_MOCK_XKEYBOARD_H_
 #pragma once
 
 #include "chrome/browser/chromeos/input_method/xkeyboard.h"
 
@@ skipping 13 matching lines @@
       const std::string& layout_name) OVERRIDE;
   virtual bool ReapplyCurrentKeyboardLayout() OVERRIDE;
   virtual void ReapplyCurrentModifierLockStatus() OVERRIDE;
   virtual void SetLockedModifiers(
       ModifierLockStatus new_caps_lock_status,
       ModifierLockStatus new_num_lock_status) OVERRIDE;
   virtual void SetNumLockEnabled(bool enable_num_lock) OVERRIDE;
   virtual void SetCapsLockEnabled(bool enable_caps_lock) OVERRIDE;
   virtual bool NumLockIsEnabled() OVERRIDE;
   virtual bool CapsLockIsEnabled() OVERRIDE;
-  virtual std::string CreateFullXkbLayoutName(
-      const std::string& layout_name) OVERRIDE;
   virtual unsigned int GetNumLockMask() OVERRIDE;
   virtual void GetLockedModifiers(bool* out_caps_lock_enabled,
                                   bool* out_num_lock_enabled) OVERRIDE;
 
   int set_current_keyboard_layout_by_name_count_;
   std::string last_layout_;
   bool caps_lock_is_enabled_;
   bool num_lock_is_enabled_;
   // TODO(yusukes): Add more variables for counting the numbers of the API calls
 
  private:
   DISALLOW_COPY_AND_ASSIGN(MockXKeyboard);
 };
 
 // TODO(yusukes): Use the mock in ui/views/ash/caps_lock_handler_browsertest.cc.
 
 }  // namespace input_method
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_INPUT_METHOD_MOCK_XKEYBOARD_H_