Improve double implementation.

dart/frog/leg/lib/mockimpl.dart

Index: dart/frog/leg/lib/mockimpl.dart
diff --git a/dart/frog/leg/lib/mockimpl.dart b/dart/frog/leg/lib/mockimpl.dart
index e9501e689e38463bd07a29586a7c48324ed63aff..5bea9c40c0e6b6825e70e4b4324899c19d3ac615 100644
--- a/dart/frog/leg/lib/mockimpl.dart
+++ b/dart/frog/leg/lib/mockimpl.dart
@@ -44,64 +44,6 @@ class StringBase {
   }
 }
 
-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;