Remove UriReferencedElement with its uri/uriOffset/uriEnd properties.

pkg/analyzer/lib/src/task/dart.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 analyzer.src.task.dart;
 
 import 'dart:collection';
 
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/ast/standard_resolution_map.dart';
@@ skipping 1533 matching lines @@
       if (directive is LibraryDirective) {
         libraryNameNode = directive.name;
         directivesToResolve.add(directive);
       } else if (directive is PartDirective) {
         StringLiteral partUri = directive.uri;
         Source partSource = directive.uriSource;
         hasPartDirective = true;
         CompilationUnit partUnit = partUnitMap[partSource];
         if (partUnit != null) {
           CompilationUnitElementImpl partElement = partUnit.element;
-          partElement.uriOffset = partUri.offset;
-          partElement.uriEnd = partUri.end;
-          partElement.uri = directive.uriContent;
           //
           // Validate that the part source is unique in the library.
           //
           if (!seenPartSources.add(partSource)) {
             errors.add(new AnalysisError(
                 librarySource,
                 partUri.offset,
                 partUri.length,
                 CompileTimeErrorCode.DUPLICATE_PART,
                 [partSource.uri]));
@@ skipping 4304 matching lines @@
 
   @override
   bool moveNext() {
     if (_newSources.isEmpty) {
       return false;
     }
     currentTarget = _newSources.removeLast();
     return true;
   }
 }