Add toStructuredText to ConstantExpression and align method names with ConstantValue

pkg/compiler/lib/src/deferred_load.dart

 // Copyright (c) 2014, 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 deferred_load;
 
 import 'common/backend_api.dart' show Backend;
 import 'common/tasks.dart' show CompilerTask;
 import 'common.dart';
 import 'compiler.dart' show Compiler;
@@ skipping 869 matching lines @@
   /// Creates a textual representation of the output unit content.
   String dump() {
     Map<OutputUnit, List<String>> elementMap = <OutputUnit, List<String>>{};
     Map<OutputUnit, List<String>> constantMap = <OutputUnit, List<String>>{};
     _elementToOutputUnit.forEach((Element element, OutputUnit output) {
       elementMap.putIfAbsent(output, () => <String>[]).add('$element');
     });
     _constantToOutputUnit.forEach((ConstantValue value, OutputUnit output) {
       constantMap
           .putIfAbsent(output, () => <String>[])
-          .add(value.toStructuredString());
+          .add(value.toStructuredText());
     });
 
     StringBuffer sb = new StringBuffer();
     for (OutputUnit outputUnit in allOutputUnits) {
       sb.write(outputUnit.name);
       List<String> elements = elementMap[outputUnit];
       if (elements != null) {
         sb.write('\n elements:');
         for (String element in elements..sort()) {
           sb.write('\n  $element');
@@ skipping 81 matching lines @@
     return result;
   }
 
   bool operator ==(other) {
     if (other is! _DeclaredDeferredImport) return false;
     return declaration == other.declaration;
   }
 
   int get hashCode => declaration.hashCode * 17;
 }