Support `void` as generic argument.

pkg/compiler/lib/src/js_backend/namer.dart

 // Copyright (c) 2011, 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 js_backend.namer;
 
 import 'dart:collection' show HashMap;
 
 import 'package:js_runtime/shared/embedded_names.dart' show JsGetName;
 
@@ skipping 618 matching lines @@
       case JsGetName.OPERATOR_AS_PREFIX:
         return asName(operatorAsPrefix);
       case JsGetName.SIGNATURE_NAME:
         return asName(operatorSignature);
       case JsGetName.RTI_NAME:
         return asName(rtiName);
       case JsGetName.TYPEDEF_TAG:
         return asName(typedefTag);
       case JsGetName.FUNCTION_TYPE_TAG:
         return asName(functionTypeTag);
-      case JsGetName.FUNCTION_TYPE_VOID_RETURN_TAG:
-        return asName(functionTypeVoidReturnTag);
       case JsGetName.FUNCTION_TYPE_RETURN_TYPE_TAG:
         return asName(functionTypeReturnTypeTag);
       case JsGetName.FUNCTION_TYPE_REQUIRED_PARAMETERS_TAG:
         return asName(functionTypeRequiredParametersTag);
       case JsGetName.FUNCTION_TYPE_OPTIONAL_PARAMETERS_TAG:
         return asName(functionTypeOptionalParametersTag);
       case JsGetName.FUNCTION_TYPE_NAMED_PARAMETERS_TAG:
         return asName(functionTypeNamedParametersTag);
       case JsGetName.IS_INDEXABLE_FIELD_NAME:
         return operatorIs(_commonElements.jsIndexingBehaviorInterface);
@@ skipping 881 matching lines @@
   String get operatorIsPrefix => r'$is';
 
   String get operatorAsPrefix => r'$as';
 
   String get operatorSignature => r'$signature';
 
   String get typedefTag => r'typedef';
 
   String get functionTypeTag => r'func';
 
-  String get functionTypeVoidReturnTag => r'v';
-
   String get functionTypeReturnTypeTag => r'ret';
 
   String get functionTypeRequiredParametersTag => r'args';
 
   String get functionTypeOptionalParametersTag => r'opt';
 
   String get functionTypeNamedParametersTag => r'named';
 
   Map<ResolutionFunctionType, jsAst.Name> functionTypeNameMap =
       new HashMap<ResolutionFunctionType, jsAst.Name>();
@@ skipping 632 matching lines @@
   void addSuggestion(String original, String suggestion) {
     assert(!_suggestedNames.containsKey(original));
     _suggestedNames[original] = suggestion;
   }
 
   bool hasSuggestion(String original) => _suggestedNames.containsKey(original);
   bool isSuggestion(String candidate) {
     return _suggestedNames.containsValue(candidate);
   }
 }