Handle the "key" field as opposed to keyIdentifier field.

third_party/WebKit/Source/core/html/forms/TextFieldInputType.cpp

 /*
  * Copyright (C) 2010 Google Inc. All rights reserved.
  * Copyright (C) 2011 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
@@ skipping 192 matching lines @@
         chromeClient->handleKeyboardEventOnTextField(element(), *event);
         return;
     }
     event->setDefaultHandled();
 }
 
 void TextFieldInputType::handleKeydownEventForSpinButton(KeyboardEvent* event)
 {
     if (element().isDisabledOrReadOnly())
         return;
-    const String& key = event->keyIdentifier();
-    if (key == "Up")
+    const String& key = event->key();
+    if (key == "ArrowUp")
         spinButtonStepUp();
-    else if (key == "Down" && !event->altKey())
+    else if (key == "ArrowDown" && !event->altKey())
         spinButtonStepDown();
     else
         return;
     element().dispatchFormControlChangeEvent();
     event->setDefaultHandled();
 }
 
 void TextFieldInputType::forwardEvent(Event* event)
 {
     if (SpinButtonElement* spinButton = spinButtonElement()) {
@@ skipping 324 matching lines @@
     return shouldSpinButtonRespondToMouseEvents() && element().focused();
 }
 
 void TextFieldInputType::spinButtonDidReleaseMouseCapture(SpinButtonElement::EventDispatch eventDispatch)
 {
     if (eventDispatch == SpinButtonElement::EventDispatchAllowed)
         element().dispatchFormControlChangeEvent();
 }
 
 } // namespace blink