Move symbol demangling to dart:_internal to remove dart:core dependency on dart:mirrors.

runtime/lib/errors_patch.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.
 
-import 'dart:mirrors' show MirrorSystem;
+import 'dart:_internal' as internal;
 import 'dart:convert' show JSON;
 
 patch class Error {
   /* patch */ static String _objectToString(Object object) {
     return Object._toString(object);
   }
 
   /* patch */ static String _stringToSafeString(String string) {
     return JSON.encode(string);
   }
@@ skipping 203 matching lines @@
       return "";
     }
     var type = _invocation_type & _InvocationMirror._TYPE_MASK;
     var level = (_invocation_type >> _InvocationMirror._CALL_SHIFT) &
          _InvocationMirror._CALL_MASK;
     var type_str =
         (const ["method", "getter", "setter", "getter or setter", "variable"])[type];
     var args_message = args_mismatch ? " with matching arguments" : "";
     var msg;
     var memberName =
-        (_memberName == null) ? "" : MirrorSystem.getName(_memberName);
+        (_memberName == null) ? "" : internal.Symbol.getUnmangledName(_memberName);
 
     if (type == _InvocationMirror._LOCAL_VAR) {
       return "cannot assign to final variable '$memberName'.\n\n";
     }
     switch (level) {
       case _InvocationMirror._DYNAMIC: {
         if (_receiver == null) {
           msg = "The null object does not have a $type_str '$memberName'"
               "$args_message.";
         } else {
@@ skipping 43 matching lines @@
           actual_buf.write(", ");
         }
         actual_buf.write(Error.safeToString(_arguments[i]));
       }
     }
     if (_namedArguments != null) {
       _namedArguments.forEach((Symbol key, var value) {
         if (i > 0) {
           actual_buf.write(", ");
         }
-        actual_buf.write(MirrorSystem.getName(key));
+        actual_buf.write(internal.Symbol.getUnmangledName(key));
         actual_buf.write(": ");
         actual_buf.write(Error.safeToString(value));
         i++;
       });
     }
     var args_mismatch = _existingArgumentNames != null;
     StringBuffer msg_buf = new StringBuffer(_developerMessage(args_mismatch));
     String receiver_str;
     var level = (_invocation_type >> _InvocationMirror._CALL_SHIFT) &
         _InvocationMirror._CALL_MASK;
     if ( level == _InvocationMirror._TOP_LEVEL) {
       receiver_str = "top-level";
     } else {
       receiver_str = Error.safeToString(_receiver);
     }
     var memberName =
-        (_memberName == null) ? "" : MirrorSystem.getName(_memberName);
+        (_memberName == null) ? "" : internal.Symbol.getUnmangledName(_memberName);
     var type = _invocation_type & _InvocationMirror._TYPE_MASK;
     if (type == _InvocationMirror._LOCAL_VAR) {
       msg_buf.write(
           "NoSuchMethodError: cannot assign to final variable '$memberName'");
     } else if (!args_mismatch) {
       msg_buf.write(
           "NoSuchMethodError: method not found: '$memberName'\n"
           "Receiver: $receiver_str\n"
           "Arguments: [$actual_buf]");
     } else {
@@ skipping 24 matching lines @@
   String toString() => "Javascript Integer Overflow: $_value";
 }
 
 class _JavascriptCompatibilityError extends Error {
   final String _msg;
 
   _JavascriptCompatibilityError(this._msg);
   String toString() => "Javascript Compatibility Error: $_msg";
 }