Refactor Parsing to remove compiler dependency

pkg/compiler/lib/src/resolution/constructors.dart

 // Copyright (c) 2015, 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 dart2js.resolution.constructors;
 
 import '../common.dart';
 import '../common/resolution.dart' show Feature;
 import '../compiler.dart' show Compiler;
 import '../constants/constructors.dart'
@@ skipping 59 matching lines @@
         ]);
     isValidAsConstant = false;
   }
 
   void checkForDuplicateInitializers(FieldElementX field, Node init) {
     // [field] can be null if it could not be resolved.
     if (field == null) return;
     if (initialized.containsKey(field)) {
       reportDuplicateInitializerError(field, init, initialized[field]);
     } else if (field.isFinal) {
-      field.parseNode(visitor.resolution.parsing);
+      field.parseNode(visitor.resolution.parsingContext);
       Expression initializer = field.initializer;
       if (initializer != null) {
         reportDuplicateInitializerError(
             field,
             init,
             reporter.withCurrentElement(
                 field, () => reporter.spanFromSpannable(initializer)));
       }
     }
     initialized[field] = init;
@@ skipping 758 matching lines @@
     // constructors.
     return null;
   }
   // TODO(johnniwinther): Use [Name] for lookup.
   ConstructorElement constructor = cls.lookupConstructor(constructorName);
   if (constructor != null) {
     constructor = constructor.declaration;
   }
   return constructor;
 }