Remove ConstantExpression.value

tests/compiler/dart2js/const_exp_test.dart

Index: tests/compiler/dart2js/const_exp_test.dart
diff --git a/tests/compiler/dart2js/const_exp_test.dart b/tests/compiler/dart2js/const_exp_test.dart
index 50b63afeabc076f6934b83fd0862cae4dceae4a9..3117c2db9f971f00f101afdd8a383e736c9476b0 100644
--- a/tests/compiler/dart2js/const_exp_test.dart
+++ b/tests/compiler/dart2js/const_exp_test.dart
@@ -31,12 +31,13 @@ test(String constantInitializer, [String expectedOutput]) {
      var element = env.getElement('constant');
      Expect.isNotNull(element, "Element 'constant' not found.");
      var constant = env.compiler.constants.getConstantForVariable(element);
+     var value = env.compiler.constants.getConstantValue(constant);
      Expect.isNotNull(constant,
                       "No constant computed for '$element'.");
      Expect.equals(expectedOutput, constant.getText(),
          "Unexpected to string '${constant.getText()}' for constant "
          "'$constantInitializer' of value "
-         "${constant.value.toStructuredString()}");
+         "${value.toStructuredString()}");
    });
 }