Remove ui::KeyEvent::platform_keycode_

ui/events/cocoa/events_mac.mm

 // 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.
 
 #include "ui/events/event_utils.h"
 
 #include <Cocoa/Cocoa.h>
 
 #include "base/logging.h"
 #import "base/mac/mac_util.h"
@@ skipping 202 matching lines @@
 }
 
 KeyboardCode KeyboardCodeFromNative(const base::NativeEvent& native_event) {
   return KeyboardCodeFromNSEvent(native_event);
 }
 
 DomCode CodeFromNative(const base::NativeEvent& native_event) {
   return CodeFromNSEvent(native_event);
 }
 
-uint32 PlatformKeycodeFromNative(const base::NativeEvent& native_event) {
-  return native_event.keyCode;
-}
-
 uint32 WindowsKeycodeFromNative(const base::NativeEvent& native_event) {
   return static_cast<uint32>(KeyboardCodeFromNSEvent(native_event));
 }
 
 uint16 TextFromNative(const base::NativeEvent& native_event) {
   NSString* text = @"";
   if ([native_event type] != NSFlagsChanged)
     text = [native_event characters];
 
   // These exceptions are based on WebInputEventFactoryMac.mm:
@@ skipping 27 matching lines @@
   uint16 return_value;
   [text getCharacters:&return_value];
   return return_value;
 }
 
 bool IsCharFromNative(const base::NativeEvent& native_event) {
   return false;
 }
 
 }  // namespace ui