Extract DartTypeVisitor and subclasses from resolution_types.

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 2092 matching lines @@
     return hash;
   }
 
   static int _finish(int hash) {
     hash = _MASK & (hash + (((_MASK >> 3) & hash) << 3));
     hash = hash & (hash >> 11);
     return _MASK & (hash + (((_MASK >> 15) & hash) << 15));
   }
 }
 
-class FunctionTypeNamer extends BaseDartTypeVisitor {
+class FunctionTypeNamer extends BaseResolutionDartTypeVisitor {
   final RuntimeTypesEncoder rtiEncoder;
   StringBuffer sb;
 
   FunctionTypeNamer(this.rtiEncoder);
 
   String computeName(ResolutionDartType type) {
     sb = new StringBuffer();
     visit(type);
     return sb.toString();
   }
@@ skipping 59 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);
   }
 }