Move parseInt parseDouble to int/double classes as a static method.

runtime/lib/double_patch.dart

 // Copyright (c) 2012, 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.
-
 // Dart core library.
 
-class bool {
-  factory bool._uninstantiable() {
-    throw const UnsupportedOperationException(
-        "class bool cannot be instantiated");
-  }
+// VM implementation of double.
+
+patch class double {
+  /* patch */
+  static double parse(String string) native "MathNatives_parseDouble";
 }