Add toStructuredText to ConstantExpression and align method names with ConstantValue

tests/compiler/dart2js/semantic_visitor_test_decl_visitor.dart

 // Copyright (c) 2015, 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.semantics_visitor_test;
 
 class SemanticDeclarationTestVisitor extends SemanticTestVisitor {
 
   SemanticDeclarationTestVisitor(TreeElements elements) : super(elements);
 
@@ skipping 218 matching lines @@
   @override
   visitOptionalParameterDeclaration(
       VariableDefinitions node,
       Node definition,
       ParameterElement parameter,
       ConstantExpression defaultValue,
       int index,
       arg) {
     visits.add(new Visit(VisitKind.VISIT_OPTIONAL_PARAMETER_DECL,
         element: parameter,
-        constant: defaultValue != null ? defaultValue.getText() : null,
+        constant: defaultValue != null ? defaultValue.toDartText() : null,
         index: index));
   }
 
   @override
   visitParameterDeclaration(
       VariableDefinitions node,
       Node definition,
       ParameterElement parameter,
       int index,
       arg) {
@@ skipping 27 matching lines @@
   }
 
   @override
   visitLocalConstantDeclaration(
       VariableDefinitions node,
       Node definition,
       LocalVariableElement variable,
       ConstantExpression constant,
       arg) {
     visits.add(new Visit(VisitKind.VISIT_LOCAL_CONSTANT_DECL,
-        element: variable, constant: constant.getText()));
+        element: variable, constant: constant.toDartText()));
   }
 
   @override
   visitNamedInitializingFormalDeclaration(
       VariableDefinitions node,
       Node definition,
       InitializingFormalElement initializingFormal,
       ConstantExpression defaultValue,
       arg) {
     visits.add(new Visit(VisitKind.VISIT_NAMED_INITIALIZING_FORMAL_DECL,
         element: initializingFormal,
-        constant: defaultValue != null ? defaultValue.getText() : null));
+        constant: defaultValue != null ? defaultValue.toDartText() : null));
   }
 
   @override
   visitNamedParameterDeclaration(
       VariableDefinitions node,
       Node definition,
       ParameterElement parameter,
       ConstantExpression defaultValue,
       arg) {
     visits.add(new Visit(VisitKind.VISIT_NAMED_PARAMETER_DECL,
         element: parameter,
-        constant: defaultValue != null ? defaultValue.getText() : null));
+        constant: defaultValue != null ? defaultValue.toDartText() : null));
   }
 
   @override
   visitOptionalInitializingFormalDeclaration(
       VariableDefinitions node,
       Node definition,
       InitializingFormalElement initializingFormal,
       ConstantExpression defaultValue,
       int index,
       arg) {
     visits.add(new Visit(VisitKind.VISIT_OPTIONAL_INITIALIZING_FORMAL_DECL,
         element: initializingFormal,
-        constant: defaultValue != null ? defaultValue.getText() : null,
+        constant: defaultValue != null ? defaultValue.toDartText() : null,
         index: index));
   }
 
   @override
   visitInstanceFieldDeclaration(
       VariableDefinitions node,
       Node definition,
       FieldElement field,
       Node initializer,
       arg) {
     visits.add(new Visit(VisitKind.VISIT_INSTANCE_FIELD_DECL,
         element: field, rhs: initializer));
     if (initializer != null) {
       apply(initializer, arg);
     }
   }
 
   @override
   visitStaticConstantDeclaration(
       VariableDefinitions node,
       Node definition,
       FieldElement field,
       ConstantExpression constant,
       arg) {
     visits.add(new Visit(VisitKind.VISIT_STATIC_CONSTANT_DECL,
-        element: field, constant: constant.getText()));
+        element: field, constant: constant.toDartText()));
   }
 
   @override
   visitStaticFieldDeclaration(
       VariableDefinitions node,
       Node definition,
       FieldElement field,
       Node initializer,
       arg) {
     visits.add(new Visit(VisitKind.VISIT_STATIC_FIELD_DECL,
         element: field, rhs: initializer));
     if (initializer != null) {
       apply(initializer, arg);
     }
   }
 
   @override
   visitTopLevelConstantDeclaration(
       VariableDefinitions node,
       Node definition,
       FieldElement field,
       ConstantExpression constant,
       arg) {
     visits.add(new Visit(VisitKind.VISIT_TOP_LEVEL_CONSTANT_DECL,
-        element: field, constant: constant.getText()));
+        element: field, constant: constant.toDartText()));
   }
 
   @override
   visitTopLevelFieldDeclaration(
       VariableDefinitions node,
       Node definition,
       FieldElement field,
       Node initializer,
       arg) {
     visits.add(new Visit(VisitKind.VISIT_TOP_LEVEL_FIELD_DECL,
@@ skipping 88 matching lines @@
       MethodElement setter,
       NodeList parameters,
       Node body,
       arg) {
     visits.add(new Visit(VisitKind.VISIT_STATIC_SETTER_DECL,
         element: setter, parameters: parameters, body: body));
     applyParameters(parameters, arg);
     apply(body, arg);
   }
 }