Fix source information positions for deserialized patched elements.

tests/compiler/dart2js/sourcemaps/sourcemap_helper.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 sourcemap.helper;
 
 import 'dart:async';
 import 'dart:io';
 import 'package:compiler/compiler_new.dart';
 import 'package:compiler/src/apiimpl.dart' as api;
@@ skipping 182 matching lines @@
     extends JavaScriptSourceInformationStrategy {
   final JavaScriptSourceInformationStrategy strategy;
   final Map<RecordedSourceInformationProcess, js.Node> processMap =
       <RecordedSourceInformationProcess, js.Node>{};
   final Map<js.Node, RecordedSourceInformationProcess> nodeMap =
       <js.Node, RecordedSourceInformationProcess>{};
 
   RecordingSourceInformationStrategy(this.strategy);
 
   @override
-  SourceInformationBuilder createBuilderForContext(AstElement element) {
-    return strategy.createBuilderForContext(element);
+  SourceInformationBuilder createBuilderForContext(ResolvedAst resolvedAst) {
+    return strategy.createBuilderForContext(resolvedAst);
   }
 
   @override
   SourceInformationProcessor createProcessor(SourceMapper sourceMapper) {
     LocationMap nodeToSourceLocationsMap =
         new _LocationRecorder();
     CodePositionRecorder codePositions = new CodePositionRecorder();
     return new RecordingSourceInformationProcessor(
         this,
         strategy.createProcessor(new RecordingSourceMapper(
@@ skipping 374 matching lines @@
       absoluteUri = base.resolveUri(uri);
     } else {
       absoluteUri = base.resolve(uri);
     }
     return sourceFiles.putIfAbsent(absoluteUri, () {
       String text = new File.fromUri(absoluteUri).readAsStringSync();
       return new StringSourceFile.fromUri(absoluteUri, text);
     });
   }
 }