Fix most implementations of UriResolver.restoreAbsolute.

pkg/analyzer/lib/source/sdk_ext.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 source.sdk_ext;
 
 import 'dart:convert';
 import 'dart:core' hide Resource;
 
 import 'package:analyzer/file_system/file_system.dart';
@@ skipping 58 matching lines @@
 
     if (partPath != null) {
       return _resolvePart(libraryEntry, partPath, importUri);
     } else {
       return _resolveEntry(libraryEntry, importUri);
     }
   }
 
   @override
   Uri restoreAbsolute(Source source) {
+    // TODO(paulberry, johnmccutchan): this has incorrect semantics because it
+    // refers to source.uri.  See dartbug.com/24090.
     String libraryName = _libraryName(source.uri);
     if (_registeredSdkExtension(libraryName)) {
       return source.uri;
     }
     return null;
   }
 
   /// Return the library name of [importUri].
   String _libraryName(Uri importUri) {
     var uri = importUri.toString();
@@ skipping 78 matching lines @@
   /// Resolve a 'part' statement inside an sdk extension.
   Source _resolvePart(Uri libraryEntry, String partPath, Uri importUri) {
     // Library part.
     var directory = pathos.dirname(libraryEntry.path);
     var partUri = new Uri.file(pathos.join(directory, partPath));
     assert(partUri.isAbsolute);
     JavaFile javaFile = new JavaFile.fromUri(partUri);
     return new FileBasedSource(javaFile, importUri);
   }
 }