DDC fixes on DDC

lib/src/codegen/js_codegen.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.
 
 library ddc.src.codegen.js_codegen;
 
 import 'dart:io' show Directory, File;
 
 import 'package:analyzer/analyzer.dart' hide ConstantEvaluator;
 import 'package:analyzer/src/generated/ast.dart' hide ConstantEvaluator;
@@ skipping 297 matching lines @@
     return _addTypeParameters(node.typeParameters, name, _statement(body));
   }
 
   /// Generates the implicit default constructor for class C of the form
   /// `C() : super() {}`.
   JS.Method _emitImplicitConstructor(
       ClassDeclaration node, String name, List<FieldDeclaration> fields) {
     // If we don't have a method body, skip this.
     if (fields.isEmpty) return null;
 
-    var body = _initializeFields(fields);
+    dynamic body = _initializeFields(fields);
     var superCall = _superConstructorCall(node);
     if (superCall != null) body = [[body, superCall]];
     return new JS.Method(
         new JS.PropertyName(name), js.call('function() { #; }', body));
   }
 
   JS.Method _emitConstructor(ConstructorDeclaration node, String className,
       List<FieldDeclaration> fields) {
     if (_externalOrNative(node)) return null;
 
@@ skipping 1384 matching lines @@
 /// Choose a canonical name from the library element.
 /// This never uses the library's name (the identifier in the `library`
 /// declaration) as it doesn't have any meaningful rules enforced.
 String jsLibraryName(LibraryElement library) => canonicalLibraryName(library);
 
 /// Path to file that will be generated for [info].
 // TODO(jmesserly): library directory should be relative to its package
 // root. For example, "package:dev_compiler/src/codegen/js_codegen.dart" would be:
 // "ddc/src/codegen/js_codegen.js" under the output directory.
 String jsOutputPath(LibraryInfo info) => '${info.name}/${info.name}.js';