Remove unnecessary List creation

pkg/analyzer/lib/src/generated/testing/element_factory.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.
 
 // This code was auto-generated, is not intended to be edited, and is subject to
 // significant change. Please see the README file for more information.
 
 library engine.testing.element_factory;
 
 import 'dart:collection';
@@ skipping 110 matching lines @@
       HashMap<String, DartObjectImpl> fieldMap = new HashMap<String, DartObjectImpl>();
       fieldMap[indexFieldName] = new DartObjectImpl(intType, new IntState(i));
       fieldMap[nameFieldName] = new DartObjectImpl(stringType, new StringState(constantName));
       DartObjectImpl value = new DartObjectImpl(enumType, new GenericState(fieldMap));
       constantElement.evaluationResult = new EvaluationResultImpl.con1(value);
       fields.add(constantElement);
     }
     //
     // Finish building the enum.
     //
-    enumElement.fields = new List.from(fields);
+    enumElement.fields = fields;
     // Client code isn't allowed to invoke the constructor, so we do not model it.
     return enumElement;
   }
 
   static ExportElementImpl exportFor(LibraryElement exportedLibrary, List<NamespaceCombinator> combinators) {
     ExportElementImpl spec = new ExportElementImpl();
     spec.exportedLibrary = exportedLibrary;
     spec.combinators = combinators;
     return spec;
   }
@@ skipping 281 matching lines @@
       setter.synthetic = true;
       setter.variable = variable;
       setter.parameters = <ParameterElement> [requiredParameter2("_${name}", type)];
       setter.returnType = VoidTypeImpl.instance;
       setter.type = new FunctionTypeImpl.con1(setter);
       variable.setter = setter;
     }
     return variable;
   }
 }