Remove ui::KeyEvent::platform_keycode_

ui/platform_window/android/platform_window_android.cc

Index: ui/platform_window/android/platform_window_android.cc
diff --git a/ui/platform_window/android/platform_window_android.cc b/ui/platform_window/android/platform_window_android.cc
index 8c8dbf675030e43749b0f04182a6f1ea5d653699..94500a25ebf30a0da68b9889b1ed599345df049c 100644
--- a/ui/platform_window/android/platform_window_android.cc
+++ b/ui/platform_window/android/platform_window_android.cc
@@ -132,12 +132,10 @@ bool PlatformWindowAndroid::KeyEvent(JNIEnv* env,
                                      jint unicode_character) {
   ui::KeyEvent key_event(pressed ? ui::ET_KEY_PRESSED : ui::ET_KEY_RELEASED,
                          ui::KeyboardCodeFromAndroidKeyCode(key_code), 0);
-  key_event.set_platform_keycode(key_code);
   delegate_->DispatchEvent(&key_event);
   if (pressed && unicode_character) {
     ui::KeyEvent char_event(unicode_character,
                             ui::KeyboardCodeFromAndroidKeyCode(key_code), 0);
-    char_event.set_platform_keycode(key_code);
     delegate_->DispatchEvent(&char_event);
   }
   return true;