Improve double implementation.

dart/frog/leg/lib/mockimpl.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.
 
 // Mocks of classes and interfaces that Leg cannot read directly.
 
 // TODO(ahe): Remove this file.
 
 class JSSyntaxRegExp implements RegExp {
   JSSyntaxRegExp(String pattern,
@@ skipping 26 matching lines @@
 
   static String join(List<String> strings, String separator) {
     throw "StringBase.join is not implemented";
   }
 
   static String concatAll(List<String> strings) {
     throw "StringBase.concatAll is not implemented";
   }
 }
 
-class MathNatives {
-  static int parseInt(String str) {
-    throw 'MathNatives.parseInt is not implemented';
-  }
-
-  static double parseDouble(String str) {
-    throw 'MathNatives.parseDouble is not implemented';
-  }
-
-  static double sqrt(num value) {
-    throw 'MathNatives.sqrt is not implemented';
-  }
-
-  static double sin(num value) {
-    throw 'MathNatives.sin is not implemented';
-  }
-
-  static double cos(num value) {
-    throw 'MathNatives.cos is not implemented';
-  }
-
-  static double tan(num value) {
-    throw 'MathNatives.tan is not implemented';
-  }
-
-  static double acos(num value) {
-    throw 'MathNatives.acos is not implemented';
-  }
-
-  static double asin(num value) {
-    throw 'MathNatives.asin is not implemented';
-  }
-
-  static double atan(num value) {
-    throw 'MathNatives.atan is not implemented';
-  }
-
-  static double atan2(num a, num b) {
-    throw 'MathNatives.atan2 is not implemented';
-  }
-
-  static double exp(num value) {
-    throw 'MathNatives.exp is not implemented';
-  }
-
-  static double log(num value) {
-    throw 'MathNatives.log is not implemented';
-  }
-
-  static num pow(num value, num exponent) {
-    throw 'MathNatives.pow is not implemented';
-  }
-
-  static double random() {
-    throw 'MathNatives.random is not implemented';
-  }
-}
-
 class TimeZoneImplementation implements TimeZone {
   const TimeZoneImplementation.utc() : isUtc = true;
   TimeZoneImplementation.local() : isUtc = false;
 
   bool operator ==(Object other) {
     if (!(other is TimeZoneImplementation)) return false;
     return isUtc == other.isUtc;
   }
 
   final bool isUtc;
@@ skipping 374 matching lines @@
   factory List([int length]) => Primitives.newList(length);
   factory List.from(Iterable<E> other) {
     List<E> result = new List<E>();
     Iterator<E> iterator = other.iterator();
     while (iterator.hasNext()) {
       result.add(iterator.next());
     }
     return result;
   }
 }