Remove ui::KeyEvent::platform_keycode_

ui/events/ozone/layout/xkb/xkb_keyboard_layout_engine.h

 // Copyright 2014 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_OZONE_LAYOUT_XKB_XKB_KEYBOARD_LAYOUT_ENGINE_H_
 #define UI_EVENTS_OZONE_LAYOUT_XKB_XKB_KEYBOARD_LAYOUT_ENGINE_H_
 
 #include <xkbcommon/xkbcommon.h>
 #include <vector>
 
@@ skipping 19 matching lines @@
   // KeyboardLayoutEngine:
   bool CanSetCurrentLayout() const override;
   bool SetCurrentLayoutByName(const std::string& layout_name) override;
 
   bool UsesISOLevel5Shift() const override;
   bool UsesAltGr() const override;
 
   bool Lookup(DomCode dom_code,
               int flags,
               DomKey* dom_key,
-              KeyboardCode* key_code,
-              uint32* platform_keycode) const override;
+              KeyboardCode* key_code) const override;
 
   static void ParseLayoutName(const std::string& layout_name,
                               std::string* layout_id,
                               std::string* layout_variant);
 
  protected:
   // Table for EventFlagsToXkbFlags().
   struct XkbFlagMapEntry {
     int ui_flag;
     xkb_mod_mask_t xkb_flag;
@@ skipping 56 matching lines @@
 
   std::string current_layout_name_;
 
   // Support weak pointers for attach & detach callbacks.
   base::WeakPtrFactory<XkbKeyboardLayoutEngine> weak_ptr_factory_;
 };
 
 }  // namespace ui
 
 #endif  // UI_EVENTS_OZONE_LAYOUT_XKB_XKB_KEYBOARD_LAYOUT_ENGINE_H_