Finish strong mode cleaning of dart2js.

pkg/compiler/lib/src/native/ssa.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.
 
 import '../common.dart';
 import '../constants/values.dart';
 import '../elements/resolution_types.dart';
 import '../elements/elements.dart';
 import '../js/js.dart' as js;
 import '../js_emitter/js_emitter.dart' show NativeEmitter;
@@ skipping 49 matching lines @@
 
   FunctionSignature parameters = element.functionSignature;
   if (!hasBody) {
     List<String> arguments = <String>[];
     List<HInstruction> inputs = <HInstruction>[];
     String receiver = '';
     if (element.isInstanceMember) {
       receiver = '#.';
       inputs.add(builder.localsHandler.readThis());
     }
-    parameters.forEachParameter((ParameterElement parameter) {
+    parameters.forEachParameter((_parameter) {
+      ParameterElement parameter = _parameter;
       ResolutionDartType type = parameter.type.unaliased;
       HInstruction input = builder.localsHandler.readLocal(parameter);
       if (type is ResolutionFunctionType) {
         // The parameter type is a function type either directly or through
         // typedef(s).
         input = convertDartClosure(parameter, type);
       }
       inputs.add(input);
       arguments.add('#');
     });
@@ skipping 33 matching lines @@
     LiteralString jsCode = nativeBody.asLiteralString();
     builder.push(new HForeignCode.statement(
         js.js.statementTemplateYielding(
             new js.LiteralStatement(jsCode.dartString.slowToString())),
         <HInstruction>[],
         new SideEffects(),
         null,
         builder.commonMasks.dynamicType));
   }
 }