Modify blink type map to finalize lazily

tools/dom/templates/html/dartium/_blink_dartium.darttemplate

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 // DO NOT EDIT
 // Auto-generated dart:_blink library.
 
 /**
  * This library provides entry points to the native Blink code which backs
  * up the dart:html library.
@@ skipping 27 matching lines @@
 import 'dart:web_audio' show AudioNode, AudioParam, web_audioBlinkMap;
 
 part '$AUXILIARY_DIR/blink_native_DOMImplementation.dart';
 
 $!GENERATED_DART_FILES
 
 // TODO(vsm): This should be moved out of this library.  Into dart:html?
 Type _getType(String key) {
   // TODO(vsm): Add Cross Frame and JS types here as well.
   if (htmlBlinkMap.containsKey(key))
-    return htmlBlinkMap[key];
+    return htmlBlinkMap[key]();
   if (indexed_dbBlinkMap.containsKey(key))
-    return indexed_dbBlinkMap[key];
+    return indexed_dbBlinkMap[key]();
   if (web_audioBlinkMap.containsKey(key))
-    return web_audioBlinkMap[key];
+    return web_audioBlinkMap[key]();
   if (web_glBlinkMap.containsKey(key))
-    return web_glBlinkMap[key];
+    return web_glBlinkMap[key]();
   if (web_sqlBlinkMap.containsKey(key))
-    return web_sqlBlinkMap[key];
+    return web_sqlBlinkMap[key]();
   if (svgBlinkMap.containsKey(key))
-    return svgBlinkMap[key];
+    return svgBlinkMap[key]();
   return null;
 }