When user renames 'prefix' in 'prefix.Class' she actually wants to rename ImportElement.

pkg/analysis_server/lib/src/services/correction/util.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 services.src.correction.util;
 
 import 'package:analysis_server/src/services/correction/change.dart';
 import 'package:analysis_server/src/services/correction/source_range.dart';
 import 'package:analysis_server/src/services/correction/strings.dart';
 import 'package:analyzer/src/generated/ast.dart';
@@ skipping 79 matching lines @@
     }
     if (node is MethodDeclaration) {
       return node.element;
     }
     node = node.parent;
   }
   return null;
 }
 
 /**
- * Returns a namespace of the given [ExportElement].
- */
-Map<String, Element> getExportNamespaceForDirective(ExportElement exp) {
-  Namespace namespace =
-      new NamespaceBuilder().createExportNamespaceForDirective(exp);
-  return namespace.definedNames;
-}
-
-
-/**
- * Returns a export namespace of the given [LibraryElement].
- */
-Map<String, Element> getExportNamespaceForLibrary(LibraryElement library) {
-  Namespace namespace =
-      new NamespaceBuilder().createExportNamespaceForLibrary(library);
-  return namespace.definedNames;
-}
-
-/**
- * Returns an [Element] exported from the given [LibraryElement].
- */
-Element getExportedElement(LibraryElement library, String name) {
-  if (library == null) {
-    return null;
-  }
-  return getExportNamespaceForLibrary(library)[name];
-}
-
-/**
  * Returns [getExpressionPrecedence] for the parent of [node],
  * or `0` if the parent node is [ParenthesizedExpression].
  *
  * The reason is that `(expr)` is always executed after `expr`.
  */
 int getExpressionParentPrecedence(AstNode node) {
   AstNode parent = node.parent;
   if (parent is ParenthesizedExpression) {
     return 0;
   }
@@ skipping 775 matching lines @@
       int newOperatorPrecedence) {
     if (expr._precedence < newOperatorPrecedence) {
       return "(${expr._source})";
     }
     return expr._source;
   }
 
   static _InvertedCondition _simple(String source) =>
       new _InvertedCondition(2147483647, source);
 }