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

third_party/WebKit/Source/core/html/forms/CheckboxInputType.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 43 matching lines @@
     return element().isRequired() && !element().checked();
 }
 
 String CheckboxInputType::valueMissingText() const
 {
     return locale().queryString(WebLocalizedString::ValidationValueMissingForCheckbox);
 }
 
 void CheckboxInputType::handleKeyupEvent(KeyboardEvent* event)
 {
-    const String& key = event->keyIdentifier();
-    if (key != "U+0020")
+    const String& key = event->key();
+    if (key != " ")
         return;
     dispatchSimulatedClickIfActive(event);
 }
 
 ClickHandlingState* CheckboxInputType::willDispatchClick()
 {
     // An event handler can use preventDefault or "return false" to reverse the checking we do here.
     // The ClickHandlingState object contains what we need to undo what we did here in didDispatchClick.
 
     ClickHandlingState* state = new ClickHandlingState;
@@ skipping 21 matching lines @@
     // The work we did in willDispatchClick was default handling.
     event->setDefaultHandled();
 }
 
 bool CheckboxInputType::shouldAppearIndeterminate() const
 {
     return element().indeterminate();
 }
 
 } // namespace blink