All strong mode cleaning of dart2js.

tests/compiler/dart2js/simple_inferrer_test.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.
 
 import 'package:expect/expect.dart';
 import "package:async_helper/async_helper.dart";
 import 'package:compiler/src/types/types.dart' show TypeMask;
 import 'type_mask_test_helper.dart';
 
 import 'compiler_helper.dart';
@@ skipping 811 matching lines @@
         checkReturn('testReturnElementOfConstList2', commonMasks.uint31Type);
         checkReturn('testReturnItselfOrInt', commonMasks.uint31Type);
         checkReturn('testReturnInvokeDynamicGetter', commonMasks.dynamicType);
 
         checkReturn('testDoWhile1', commonMasks.stringType);
         checkReturn('testDoWhile2', commonMasks.nullType);
         checkReturn('testDoWhile3', commonMasks.uint31Type);
         checkReturn('testDoWhile4', commonMasks.numType);
 
         checkReturnInClass(String className, String methodName, type) {
-          var cls = findElement(compiler, className);
+          dynamic cls = findElement(compiler, className);
           var element = cls.lookupLocalMember(methodName);
           Expect.equals(
               type,
               simplify(
                   typesInferrer.getReturnTypeOfElement(element), closedWorld),
               '$className:$methodName');
         }
 
         checkReturnInClass('A', 'returnInt1', commonMasks.uint32Type);
         checkReturnInClass('A', 'returnInt2', commonMasks.uint32Type);
@@ skipping 14 matching lines @@
         checkReturnInClass('B', 'returnInt9', commonMasks.uint31Type);
 
         checkReturnInClass('C', 'returnInt1', commonMasks.positiveIntType);
         checkReturnInClass('C', 'returnInt2', commonMasks.positiveIntType);
         checkReturnInClass('C', 'returnInt3', commonMasks.positiveIntType);
         checkReturnInClass('C', 'returnInt4', commonMasks.positiveIntType);
         checkReturnInClass('C', 'returnInt5', commonMasks.positiveIntType);
         checkReturnInClass('C', 'returnInt6', commonMasks.positiveIntType);
 
         checkFactoryConstructor(String className, String factoryName) {
-          var cls = findElement(compiler, className);
+          dynamic cls = findElement(compiler, className);
           var element = cls.localLookup(factoryName);
           Expect.equals(new TypeMask.nonNullExact(cls, closedWorld),
               typesInferrer.getReturnTypeOfElement(element));
         }
 
         checkFactoryConstructor('A', '');
 
         checkReturn('testCascade1', commonMasks.growableListType);
         ClassElement clsCascadeHelper = findElement(compiler, 'CascadeHelper');
         checkReturn('testCascade2',
             new TypeMask.nonNullExact(clsCascadeHelper, closedWorld));
         checkReturn('testSpecialization1', commonMasks.numType);
         checkReturn('testSpecialization2', commonMasks.dynamicType);
         checkReturn('testSpecialization3', commonMasks.uint31Type.nullable());
         checkReturn('testReturnNull1', commonMasks.nullType);
         checkReturn('testReturnNull2', commonMasks.nullType);
         checkReturn('testReturnNull3', commonMasks.dynamicType);
         checkReturn('testReturnNull4', commonMasks.nullType);
         checkReturn('testReturnNull5', commonMasks.nullType);
         checkReturn('testReturnNull6', commonMasks.dynamicType);
         checkReturn('testReturnNotEquals', commonMasks.boolType);
       }));
 }