Use LinkedDependency.parts to find part URIs during resynthesis.

pkg/analyzer/lib/src/summary/resynthesize.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 summary_resynthesizer;
 
 import 'dart:collection';
 
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/element/element.dart';
@@ skipping 1405 matching lines @@
         partUri = partSource.uri.toString();
       } else {
         partUri = referencedLibraryUri;
       }
       return <String>[referencedLibraryUri, partUri, name];
     }
     LinkedDependency dependency = linkedLibrary.dependencies[dependencyIndex];
     Source referencedLibrarySource = summaryResynthesizer.sourceFactory
         .resolveUri(librarySource, dependency.uri);
     String referencedLibraryUri = referencedLibrarySource.uri.toString();
-    // TODO(paulberry): consider changing Location format so that this is
-    // not necessary (2nd string in location should just be the unit
-    // number).
     String partUri;
     if (unit != 0) {
-      UnlinkedUnit referencedLibraryDefiningUnit =
-          summaryResynthesizer._getUnlinkedSummaryOrThrow(referencedLibraryUri);
-      String uri =
-          referencedLibraryDefiningUnit.publicNamespace.parts[unit - 1];
+      String uri = dependency.parts[unit - 1];
       Source partSource = summaryResynthesizer.sourceFactory
           .resolveUri(referencedLibrarySource, uri);
       partUri = partSource.uri.toString();
     } else {
       partUri = referencedLibraryUri;
     }
     return <String>[referencedLibraryUri, partUri, name];
   }
 
   /**
@@ skipping 261 matching lines @@
                 }
               : () => this.element;
       // TODO(paulberry): Is it a bug that we have to pass `false` for
       // isInstantiated?
       return new DeferredFunctionTypeImpl(computer, null, typeArguments, false);
     } else {
       return null;
     }
   }
 }