Switch KeyboardEvents over to NewEventHandler

sky/framework/sky-input.sky

 <!--
 // Copyright 2015 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.
 -->
 <import src="/sky/framework/shell.sky" as="shell" />
 <import src="/sky/framework/sky-element/sky-element.sky" as="SkyElement" />
 <import src="/mojo/services/keyboard/public/interfaces/keyboard.mojom.sky" as="keyboard" />
 
 <sky-element name="sky-input" attributes="value:string">
@@ skipping 39 matching lines @@
     }.bind(this));
 
     observer.observe(control, {
       subtree: true,
       characterData: true,
       childList: true,
     });
   }
   handleKeyDown(event) {
     // TODO(abarth): You can still get newlines if the user pastes them.
-    if (event.keyCode == 0xD)
+    if (event.key == 0xD)
       event.preventDefault();
   }
   handleFocus(event) {
     keyboard.show();
   }
   handleBlur(event) {
     keyboard.hide();
   }
 }.register();
 </script>
 </sky-element>