All strong mode cleaning of dart2js.

pkg/compiler/lib/src/inferrer/locals_handler.dart

 // Copyright (c) 2013, 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 locals_handler;
 
 import 'dart:collection' show IterableMixin;
 
 import '../options.dart' show CompilerOptions;
 import '../elements/elements.dart';
@@ skipping 192 matching lines @@
 
   void forEach(void f(TypeInformation type)) {
     positional.forEach(f);
     named.values.forEach(f);
   }
 
   bool every(bool f(TypeInformation type)) {
     return positional.every(f) && named.values.every(f);
   }
 
-  bool contains(TypeInformation type) {
+  bool contains(Object type) {
     return positional.contains(type) || named.containsValue(type);
   }
 }
 
 class ArgumentsTypesIterator implements Iterator<TypeInformation> {
   final Iterator<TypeInformation> positional;
   final Iterator<TypeInformation> named;
   bool _iteratePositional = true;
 
   ArgumentsTypesIterator(ArgumentsTypes iteratee)
@@ skipping 320 matching lines @@
       if (newType != type) {
         locals[variable] = newType;
       }
     });
   }
 
   void updateField(Element element, TypeInformation type) {
     fieldScope.updateField(element, type);
   }
 }