Remove DartString from constants.

pkg/compiler/lib/src/mirrors_used.dart

 // Copyright (c) 2013, 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.
 
 library dart2js.mirrors_used;
 
 import 'common/tasks.dart' show CompilerTask;
 import 'common.dart';
 import 'compile_time_constants.dart' show ConstantCompiler;
 import 'compiler.dart' show Compiler;
@@ skipping 365 matching lines @@
   List convertConstantToUsageList(ConstantValue constant,
       {bool onlyStrings: false}) {
     if (constant.isNull) {
       return null;
     } else if (constant.isList) {
       ListConstantValue list = constant;
       List result = onlyStrings ? <String>[] : [];
       for (ConstantValue entry in list.entries) {
         if (entry.isString) {
           StringConstantValue string = entry;
-          result.add(string.primitiveValue.slowToString());
+          result.add(string.primitiveValue);
         } else if (!onlyStrings && entry.isType) {
           TypeConstantValue type = entry;
           result.add(type.representedType);
         } else {
           Spannable node = positionOf(entry);
           MessageKind kind = onlyStrings
               ? MessageKind.MIRRORS_EXPECTED_STRING
               : MessageKind.MIRRORS_EXPECTED_STRING_OR_TYPE;
           reporter.reportHintMessage(
               node, kind, {'name': node, 'type': apiTypeOf(entry)});
         }
       }
       return result;
     } else if (!onlyStrings && constant.isType) {
       TypeConstantValue type = constant;
       return [type.representedType];
     } else if (constant.isString) {
       StringConstantValue string = constant;
-      var iterable =
-          string.primitiveValue.slowToString().split(',').map((e) => e.trim());
+      var iterable = string.primitiveValue.split(',').map((e) => e.trim());
       return onlyStrings ? new List<String>.from(iterable) : iterable.toList();
     } else {
       Spannable node = positionOf(constant);
       MessageKind kind = onlyStrings
           ? MessageKind.MIRRORS_EXPECTED_STRING_OR_LIST
           : MessageKind.MIRRORS_EXPECTED_STRING_TYPE_OR_LIST;
       reporter.reportHintMessage(
           node, kind, {'name': node, 'type': apiTypeOf(constant)});
       return null;
     }
@@ skipping 150 matching lines @@
       // @MirrorsUsed(targets: fisk)
       //                       ^^^^
       //
       // Instead of saying 'fisk' should pretty print the problematic constant
       // value.
       return spannable;
     }
     return node;
   }
 }