Restore UriReferencedElement and its uri/uriOffset/uriEnd properties.

pkg/analyzer/lib/src/dart/element/builder.dart

Index: pkg/analyzer/lib/src/dart/element/builder.dart
diff --git a/pkg/analyzer/lib/src/dart/element/builder.dart b/pkg/analyzer/lib/src/dart/element/builder.dart
index 97efdd872597585ad7bfb71cd4e3f09876010f00..f05c401bc228fb9e0e03439be75d346e07b12597 100644
--- a/pkg/analyzer/lib/src/dart/element/builder.dart
+++ b/pkg/analyzer/lib/src/dart/element/builder.dart
@@ -890,6 +890,11 @@ class DirectiveElementBuilder extends SimpleAstVisitor<Object> {
       ExportElementImpl exportElement = new ExportElementImpl(node.offset);
       exportElement.metadata = _getElementAnnotations(node.metadata);
       StringLiteral uriLiteral = node.uri;
+      if (uriLiteral != null) {
+        exportElement.uriOffset = uriLiteral.offset;
+        exportElement.uriEnd = uriLiteral.end;
+      }
+      exportElement.uri = node.selectedUriContent;
       exportElement.combinators = _buildCombinators(node);
       exportElement.exportedLibrary = exportedLibrary;
       setElementDocumentationComment(exportElement, node);
@@ -930,6 +935,11 @@ class DirectiveElementBuilder extends SimpleAstVisitor<Object> {
       ImportElementImpl importElement = new ImportElementImpl(node.offset);
       importElement.metadata = _getElementAnnotations(node.metadata);
       StringLiteral uriLiteral = node.uri;
+      if (uriLiteral != null) {
+        importElement.uriOffset = uriLiteral.offset;
+        importElement.uriEnd = uriLiteral.end;
+      }
+      importElement.uri = node.selectedUriContent;
       importElement.deferred = node.deferredKeyword != null;
       importElement.combinators = _buildCombinators(node);
       importElement.importedLibrary = importedLibrary;