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

lib/math/base.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 part of the dart:math library.
 
 /**
  * Base of the natural logarithms.
  *
  * Typically written as "e".
@@ skipping 28 matching lines @@
 /**
  * Square root of 1/2.
  */
 const double SQRT1_2 = 0.7071067811865476;
 
 /**
  * Square root of 2.
  */
 const double SQRT2 = 1.4142135623730951;
 
-/**
- * Parses a [String] representation of an [int], and returns an [int].
- *
- * Throws a [FormatException] if [str] cannot be parsed as an [int].
- */
-external int parseInt(String str);
+/** Temporary redirect to [int.parse]. */
+int parseInt(String string) => int.parse(string);
 
-/**
- * Parses a [String] representation of a [double], and returns a [double].
- *
- * Throws a [FormatException] if [str] cannot be parsed as a [double].
- */
-external double parseDouble(String str);
+/** Temporary redirect to [double.parse]. */
+double parseDouble(String string) => double.parse(string);
 
 /**
   * Returns the lesser of two numbers.
   *
   * Returns NaN if either argument is NaN.
   * The lesser of [:-0.0:] and [:0.0:] is [:-0.0:].
   * If the arguments are otherwise equal (including int and doubles with the
   * same mathematical value) then it is unspecified which of the two arguments
   * is returned.
   */
@@ skipping 154 matching lines @@
  * Returns NaN if [x] is NaN.
  */
 external double exp(num x);
 
 /**
  * Converts [x] to a double and returns the natural logarithm of the value.
  * Returns negative infinity if [x] is equal to zero.
  * Returns NaN if [x] is NaN or less than zero.
  */
 external double log(num x);