Revert "Add sharedfrontend package"

pkg/analyzer2dart/lib/src/semantic_visitor.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.
 
 library analyzer2dart.semantic_visitor;
 
 import 'package:analyzer/analyzer.dart';
 import 'package:analyzer/src/generated/source.dart';
-import 'package:sharedfrontend/src/access_semantics.dart';
 
 import 'util.dart';
 import 'identifier_semantics.dart';
 
 /// An AST visitor which uses the [AccessSemantics] of invocations and accesses
 /// to fine-grain visitor methods.
 abstract class SemanticVisitor<R> extends RecursiveAstVisitor<R> {
 
   Source get currentSource;
 
@@ skipping 243 matching lines @@
         case AccessKind.STATIC_PROPERTY:
           return visitStaticPropertyAssignment(node, semantics);
         default:
           // Unexpected access kind.
           return giveUp(node,
               'Unexpected ${semantics} in _handlePropertyAccess.');
       }
     }
   }
 }