- Move MathNatives from dart:core to dart:math.

runtime/lib/lib_sources.gypi

 # 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.
 
 # Sources visible via default library.
 
 {
   'sources': [
     'date.cc',
     'date_patch.dart',
@@ skipping 10 matching lines @@
     'expando_patch.dart',
     'function_patch.dart',
     'growable_array.cc',
     'growable_array.dart',
     'immutable_map.dart',
     'integers.cc',
     'integers.dart',
     'integers_patch.dart',
     'invocation_mirror_patch.dart',
     'map_patch.dart',
-    'math.dart',
-    'math.cc',
     'object.cc',
     'object_patch.dart',
     'print_patch.dart',
     'regexp.cc',
     'regexp_jsc.cc',
     'regexp_jsc.h',
     'regexp_patch.dart',
     'stopwatch_patch.dart',
     'stopwatch.cc',
     'string.cc',
     'string_base.dart',
     'string_patch.dart',
     'type_patch.dart',
     'string_patch.dart',
     'weak_property.dart',
     'weak_property.cc',
   ],
 }