[KeyboardEvent] Use DOM |code| rather than Windows-based key code

ui/events/keycodes/keyboard_code_conversion.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_EVENTS_KEYCODES_KEYBOARD_CODE_CONVERSION_H_
 #define UI_EVENTS_KEYCODES_KEYBOARD_CODE_CONVERSION_H_
 
 #include "base/compiler_specific.h"
 #include "base/strings/string16.h"
 #include "ui/events/events_base_export.h"
 #include "ui/events/keycodes/keyboard_codes.h"
 
 namespace ui {
 
 enum class DomCode;
 enum class DomKey;
 
-// Helper functions to get the meaning of a Windows key code in a
+// Helper functions to get the meaning of a  DOM |code| in a
 // platform independent way. It supports control characters as well.
 // It assumes a US keyboard layout is used, so it may only be used when there
 // is no native event or no better way to get the character.
 //
 // For example, if a virtual keyboard implementation can only generate key
 // events with key_code and flags information, then there is no way for us to
 // determine the actual character that should be generate by the key. Because
 // a key_code only represents a physical key on the keyboard, it has nothing
 // to do with the actual character printed on that key. In such case, the only
 // thing we can do is to assume that we are using a US keyboard and get the
 // character according to US keyboard layout definition. Preferably, such
 // events should be created using a full KeyEvent constructor, explicitly
 // specifying the character and DOM 3 values as well as the legacy VKEY.
-//
+
 // TODO(kpschoedel): replace remaining uses of the ...FromKeyCode() functions
 // and remove them, to avoid future creation of underspecified key events.
 // crbug.com/444045
 EVENTS_BASE_EXPORT base::char16 GetCharacterFromKeyCode(KeyboardCode key_code,
                                                         int flags);
 EVENTS_BASE_EXPORT bool GetMeaningFromKeyCode(KeyboardCode key_code,
                                               int flags,
                                               DomKey* dom_key,
                                               base::char16* character);
 
@@ skipping 42 matching lines @@
 
 // Determine the located VKEY corresponding to a non-located VKEY.
 EVENTS_BASE_EXPORT KeyboardCode
 NonLocatedToLocatedKeyboardCode(KeyboardCode key_code, DomCode dom_code);
 
 // Returns a DOM Level 3 |code| from a Windows-based VKEY value.
 // This assumes a US layout and should only be used when |code| cannot be
 // determined from a physical scan code, for example when a key event was
 // generated synthetically by JavaScript with only a VKEY value supplied.
 EVENTS_BASE_EXPORT DomCode UsLayoutKeyboardCodeToDomCode(KeyboardCode key_code);
-
 }  // namespace ui
 
 #endif  // UI_EVENTS_KEYCODES_KEYBOARD_CODE_CONVERSION_H_