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

runtime/lib/math_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.
 
 // A VM patch of the dart:math library.
-patch int parseInt(String str) => MathNatives.parseInt(str);
-patch double parseDouble(String str) => MathNatives.parseDouble(str);
 patch num pow(num x, num exponent) => MathNatives.pow(x, exponent);
 patch double atan2(num a, num b) => MathNatives.atan2(a, b);
 patch double sin(num x) => MathNatives.sin(x);
 patch double cos(num x) => MathNatives.cos(x);
 patch double tan(num x) => MathNatives.tan(x);
 patch double acos(num x) => MathNatives.acos(x);
 patch double asin(num x) => MathNatives.asin(x);
 patch double atan(num x) => MathNatives.atan(x);
 patch double sqrt(num x) => MathNatives.sqrt(x);
 patch double exp(num x) => MathNatives.exp(x);
@@ skipping 70 matching lines @@
   static int _nextSeed() {
     if (_prng == null) {
       // TODO(iposva): Use system to get a random seed.
       _prng = new Random(new Date.now().millisecondsSinceEpoch);
     }
     // Trigger the PRNG once to change the internal state.
     _prng._nextInt32();
     return _prng._state;
   }
 }