Modify dev_compiler to use analyzer's new AstFactory class.

pkg/dev_compiler/lib/src/compiler/reify_coercions.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.
 
 import 'package:analyzer/analyzer.dart' as analyzer;
 import 'package:analyzer/dart/ast/ast.dart';
+import 'package:analyzer/dart/ast/standard_ast_factory.dart';
 import 'package:analyzer/dart/element/type.dart' show DartType;
 import 'package:analyzer/src/dart/ast/ast.dart' show FunctionBodyImpl;
 import 'package:analyzer/src/dart/ast/utilities.dart' show NodeReplacer;
 import 'package:analyzer/src/dart/element/type.dart' show DynamicTypeImpl;
 import 'package:analyzer/src/generated/parser.dart' show ResolutionCopier;
 import 'package:analyzer/src/task/strong/ast_properties.dart' as ast_properties;
 import 'package:logging/logging.dart' as logger;
 
 import 'ast_builder.dart' show AstBuilder, RawAstBuilder;
 import 'element_helpers.dart' show isInlineJS;
@@ skipping 16 matching lines @@
 
   /// Returns true if the `as` [node] was created by this class.
   // TODO(sra): Find a better way to recognize reified coercion, since we
   // can't set the isSynthetic attribute.
   static bool isImplicitCast(AsExpression node) => node.asOperator.offset == 0;
 
   /// Creates an implicit cast for expression [e] to [toType].
   static Expression castExpression(Expression e, DartType toType) {
     // We use an empty name in the AST, because the JS code generator only cares
     // about the target type. It does not look at the AST name.
-    var typeName = new TypeName(AstBuilder.identifierFromString(''), null);
+    var typeName =
+        astFactory.typeName(AstBuilder.identifierFromString(''), null);
     typeName.type = toType;
     var cast = AstBuilder.asExpression(e, typeName);
     cast.staticType = toType;
     return cast;
   }
 
   @override
   CompilationUnit visitCompilationUnit(CompilationUnit node) {
     if (ast_properties.hasImplicitCasts(node)) {
       // Clone compilation unit, so we don't modify the originals.
@@ skipping 117 matching lines @@
 
   // TODO(jmesserly): workaround for
   // https://github.com/dart-lang/sdk/issues/26368
   @override
   TypeName visitTypeName(TypeName node) {
     var clone = super.visitTypeName(node);
     clone.type = node.type;
     return clone;
   }
 }