Add toStructuredText to ConstantExpression and align method names with ConstantValue

pkg/compiler/lib/src/mirrors/dart2js_instance_mirrors.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.
 
 part of dart2js.mirrors;
 
 abstract class ObjectMirrorMixin implements ObjectMirror {
   InstanceMirror getField(Symbol fieldName) {
     throw new UnsupportedError('ObjectMirror.getField unsupported.');
   }
@@ skipping 55 matching lines @@
 class Dart2JsConstantMirror extends Object
     with ObjectMirrorMixin, InstanceMirrorMixin {
   final Dart2JsMirrorSystem mirrorSystem;
   final ConstantExpression _constant;
   final ConstantValue _value;
 
   Dart2JsConstantMirror(this.mirrorSystem, this._constant, this._value);
 
   String toString() {
     if (_constant != null) {
-      return _constant.getText();
+      return _constant.toDartText();
     } else {
-      return _value.unparse();
+      return _value.toDartText();
     }
   }
 
   ClassMirror get type {
     return mirrorSystem._getTypeDeclarationMirror(
         _value.getType(mirrorSystem.compiler.coreTypes).element);
   }
 
   int get hashCode => 13 * _constant.hashCode;
 
@@ skipping 188 matching lines @@
       return new Dart2JsBoolConstantMirror.fromBool(mirrorSystem, isDocComment);
     } else if (fieldName == #text) {
       return new Dart2JsStringConstantMirror.fromString(mirrorSystem, text);
     } else if (fieldName == #trimmedText) {
       return new Dart2JsStringConstantMirror.fromString(
           mirrorSystem, trimmedText);
     }
     return super.getField(fieldName);
   }
 }