Use standard DOM code definitions instead of custom.

remoting/protocol/usb_key_codes.h

-// Copyright 2015 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 REMOTING_PROTOCOL_USB_KEY_CODES_H_
-#define REMOTING_PROTOCOL_USB_KEY_CODES_H_
-
-// Frequently used USB key-codes (not comprehensive--add more as needed).
-// TODO(liaoyuke): This could be cleaned up by reusing the data in
-// "ui/events/keycodes/dom/keycode_converter_data.inc".
-
-enum {
-  kUsbA            = 0x070004,
-  kUsbN            = 0x070011,
-  kUsbW            = 0x07001a,
-  kUsbEnter        = 0x070028,
-  kUsbTab          = 0x07002b,
-  kUsbCapsLock     = 0x070039,
-  kUsbF4           = 0x07003d,
-  kUsbInsert       = 0x070049,
-  kUsbDelete       = 0x07004c,
-  kUsbLeftControl  = 0x0700e0,
-  kUsbLeftShift    = 0x0700e1,
-  kUsbLeftAlt      = 0x0700e2,
-  kUsbLeftOs       = 0x0700e3,
-  kUsbRightArrow   = 0x07004f,
-  kUsbRightControl = 0x0700e4,
-  kUsbRightShift   = 0x0700e5,
-  kUsbRightAlt     = 0x0700e6,
-  kUsbRightOs      = 0x0700e7
-};
-
-#endif  // REMOTING_PROTOCOL_USB_KEY_CODES_H_