Remove UriReferencedElement with its uri/uriOffset/uriEnd properties.

pkg/analyzer/lib/src/generated/error_verifier.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 analyzer.src.generated.error_verifier;
 
 import 'dart:collection';
 import "dart:math" as math;
 
 import 'package:analyzer/dart/ast/ast.dart';
@@ skipping 3548 matching lines @@
    * [ExportElement] retrieved from the node, if the element in the node was
    * `null`, then this method is not called.
    *
    * See [CompileTimeErrorCode.EXPORT_INTERNAL_LIBRARY].
    */
   void _checkForExportInternalLibrary(
       ExportDirective directive, ExportElement exportElement) {
     if (_isInSystemLibrary) {
       return;
     }
+
+    LibraryElement exportedLibrary = exportElement.exportedLibrary;
+    if (exportedLibrary == null) {
+      return;
+    }
+
     // should be private
     DartSdk sdk = _currentLibrary.context.sourceFactory.dartSdk;
-    String uri = exportElement.uri;
+    String uri = exportedLibrary.source.uri.toString();
     SdkLibrary sdkLibrary = sdk.getSdkLibrary(uri);
     if (sdkLibrary == null) {
       return;
     }
     if (!sdkLibrary.isInternal) {
       return;
     }
 
     _errorReporter.reportErrorForNode(
         CompileTimeErrorCode.EXPORT_INTERNAL_LIBRARY,
@@ skipping 590 matching lines @@
    * [ImportElement] retrieved from the node, if the element in the node was
    * `null`, then this method is not called
    *
    * See [CompileTimeErrorCode.IMPORT_INTERNAL_LIBRARY].
    */
   void _checkForImportInternalLibrary(
       ImportDirective directive, ImportElement importElement) {
     if (_isInSystemLibrary) {
       return;
     }
+
+    LibraryElement importedLibrary = importElement.importedLibrary;
+    if (importedLibrary == null) {
+      return;
+    }
+
     // should be private
     DartSdk sdk = _currentLibrary.context.sourceFactory.dartSdk;
-    String uri = importElement.uri;
+    String uri = importedLibrary.source.uri.toString();
     SdkLibrary sdkLibrary = sdk.getSdkLibrary(uri);
     if (sdkLibrary == null || !sdkLibrary.isInternal) {
       return;
     }
 
     _errorReporter.reportErrorForNode(
         CompileTimeErrorCode.IMPORT_INTERNAL_LIBRARY,
         directive,
         [directive.uri]);
   }
@@ skipping 2941 matching lines @@
 class _InvocationCollector extends RecursiveAstVisitor {
   final List<String> superCalls = <String>[];
 
   @override
   visitMethodInvocation(MethodInvocation node) {
     if (node.target is SuperExpression) {
       superCalls.add(node.methodName.name);
     }
   }
 }