Fix recently introduced strong mode errors

pkg/analysis_server/lib/src/services/refactoring/extract_method.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.
 
 library services.src.refactoring.extract_method;
 
 import 'dart:async';
 
 import 'package:analysis_server/src/protocol_server.dart' hide Element;
 import 'package:analysis_server/src/services/correction/name_suggestion.dart';
@@ skipping 547 matching lines @@
 
   String _getTypeCode(DartType type) {
     return utils.getTypeSource(type, librariesToImport);
   }
 
   void _initializeHasAwait() {
     _HasAwaitVisitor visitor = new _HasAwaitVisitor();
     if (_selectionExpression != null) {
       _selectionExpression.accept(visitor);
     } else if (_selectionStatements != null) {
-      _selectionStatements.forEach((statement) => statement.accept(visitor));
+      _selectionStatements.forEach((statement) {
+        statement.accept(visitor);
+      });
     }
     _hasAwait = visitor.result;
   }
 
   /**
    * Fills [_occurrences] field.
    */
   void _initializeOccurrences() {
     _occurrences.clear();
     // prepare selection
@@ skipping 661 matching lines @@
       return false;
     }
     for (int i = 0; i < parameterTypes.length; i++) {
       if (other.parameterTypes[i] != parameterTypes[i]) {
         return false;
       }
     }
     return true;
   }
 }