Removes dartc reliance on its own libraries, now can be targeted at any implementation's libraries

compiler/lib/implementation/math_natives.dart

Index: compiler/lib/implementation/math_natives.dart
diff --git a/compiler/lib/implementation/math_natives.dart b/compiler/lib/implementation/math_natives.dart
deleted file mode 100644
index 860ca2b121ac12a06270e4d79f47057292abc8db..0000000000000000000000000000000000000000
--- a/compiler/lib/implementation/math_natives.dart
+++ /dev/null
@@ -1,26 +0,0 @@
-// Copyright (c) 2011, 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 MathNatives {
-  static double cos(num d) native;
-  static double sin(num d) native;
-  static double tan(num d) native;
-  static double acos(num d) native;
-  static double asin(num d) native;
-  static double atan(num d) native;
-  static double atan2(num a, num b) native;
-  static double sqrt(num d) native;
-  static double exp(num d) native;
-  static double log(num d) native;
-  static double pow(num d1, num d2) native;
-  static double random() native;
-  static int parseInt(String str) native;
-  static double parseDouble(String str) native;
-
-  static BadNumberFormatException _newBadNumberFormat(x) native {
-    return new BadNumberFormatException(x);
-  }
-}