Late night strong mode cleaning.

tests/compiler/dart2js/inference/enumerator.dart

 // Copyright (c) 2017, 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:compiler/src/elements/elements.dart';
 import 'package:compiler/src/resolution/access_semantics.dart';
 import 'package:compiler/src/resolution/send_structure.dart';
 import 'package:compiler/src/resolution/tree_elements.dart';
 import 'package:compiler/src/tree/nodes.dart' as ast;
 import 'package:kernel/ast.dart' as ir;
@@ skipping 72 matching lines @@
   NodeId computeAccessId(ast.Send node, AccessSemantics access) {
     switch (access.kind) {
       case AccessKind.DYNAMIC_PROPERTY:
         return new NodeId(node.selector.getBeginToken().charOffset);
       default:
         return new NodeId(node.getBeginToken().charOffset);
     }
   }
 
   NodeId computeNodeId(ast.Send node) {
-    var sendStructure = elements.getSendStructure(node);
+    dynamic sendStructure = elements.getSendStructure(node);
     if (sendStructure == null) return null;
     switch (sendStructure.kind) {
       case SendStructureKind.GET:
       case SendStructureKind.INVOKE:
       case SendStructureKind.INCOMPATIBLE_INVOKE:
         return computeAccessId(node, sendStructure.semantics);
       default:
         return new NodeId(node.getBeginToken().charOffset);
     }
   }
@@ skipping 124 matching lines @@
     if (found == null) {
       Id id = computeElementId(node);
       if (id == soughtId) {
         found = node;
         return;
       }
       defaultNode(node);
     }
   }
 }