Mark more code as deprecated

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 355 matching lines @@
         new PropertyAccessorElementImpl.forVariable(field);
     getter.getter = true;
     getter.variable = field;
     getter.returnType = type;
     field.getter = getter;
     FunctionTypeImpl getterType = new FunctionTypeImpl(getter);
     getter.type = getterType;
     return getter;
   }
 
+  @deprecated
   static HtmlElementImpl htmlUnit(AnalysisContext context, String fileName) {
     Source source =
         new NonExistingSource(fileName, toUri(fileName), UriKind.FILE_URI);
     HtmlElementImpl unit = new HtmlElementImpl(context, fileName);
     unit.source = source;
     return unit;
   }
 
   static ImportElementImpl importFor(
       LibraryElement importedLibrary, PrefixElement prefix,
@@ skipping 169 matching lines @@
     }
     return variable;
   }
 
   static TypeParameterElementImpl typeParameterElement(String name) {
     TypeParameterElementImpl element = new TypeParameterElementImpl(name, 0);
     element.type = new TypeParameterTypeImpl(element);
     return element;
   }
 }