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

runtime/lib/integers_patch.dart

Index: runtime/lib/integers_patch.dart
diff --git a/lib/core/bool.dart b/runtime/lib/integers_patch.dart
similarity index 62%
copy from lib/core/bool.dart
copy to runtime/lib/integers_patch.dart
index 3225a9989978ca9d4a380f1b35574bef900fdcb6..c931ed44dc986f610be38237504e1ba698619337 100644
--- a/lib/core/bool.dart
+++ b/runtime/lib/integers_patch.dart
@@ -1,12 +1,10 @@
 // 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 int.
+
+patch class int {
+  /* patch */ static int parse(String str) native "MathNatives_parseInt";
 }