Correctly compile unresolved for-in loops.

dart/tests/compiler/dart2js/deferred_load_graph_segmentation_test.dart

Index: dart/tests/compiler/dart2js/deferred_load_graph_segmentation_test.dart
diff --git a/dart/tests/compiler/dart2js/deferred_load_graph_segmentation_test.dart b/dart/tests/compiler/dart2js/deferred_load_graph_segmentation_test.dart
index cec769e8ebae67f74d412695c591f2f272b83770..20d6e90c6e33b1caf8948920203876115db822f2 100644
--- a/dart/tests/compiler/dart2js/deferred_load_graph_segmentation_test.dart
+++ b/dart/tests/compiler/dart2js/deferred_load_graph_segmentation_test.dart
@@ -7,46 +7,18 @@
 // much be included in the initial download (loaded eagerly).
 
 import 'package:expect/expect.dart';
-import 'dart:async' show Future;
-import 'dart:uri' show Uri;
-import 'dart:io';
-
-import '../../../sdk/lib/_internal/compiler/implementation/apiimpl.dart'
-       show Compiler;
+import 'memory_source_file_helper.dart';
 
 import '../../../sdk/lib/_internal/compiler/implementation/dart2jslib.dart'
        as dart2js;
 
-import '../../../sdk/lib/_internal/compiler/implementation/filenames.dart'
-       show getCurrentDirectory, nativeToUriPath;
-
-import '../../../sdk/lib/_internal/compiler/implementation/source_file.dart'
-       show SourceFile;
-
-import '../../../sdk/lib/_internal/compiler/implementation/source_file_provider.dart'
-       show FormattingDiagnosticHandler,
-            SourceFileProvider;
-
-class MemorySourceFileProvider extends SourceFileProvider {
-  Future<String> readStringFromUri(Uri resourceUri) {
-    if (resourceUri.scheme != 'memory') {
-      return super.readStringFromUri(resourceUri);
-    }
-    String source = MEMORY_SOURCE_FILES[resourceUri.path];
-    // TODO(ahe): Return new Future.immediateError(...) ?
-    if (source == null) throw 'No such file $resourceUri';
-    String resourceName = '$resourceUri';
-    this.sourceFiles[resourceName] = new SourceFile(resourceName, source);
-    return new Future.immediate(source);
-  }
-}
-
 void main() {
   Uri cwd = getCurrentDirectory();
   Uri script = cwd.resolve(nativeToUriPath(new Options().script));
   Uri libraryRoot = script.resolve('../../../sdk/');
   Uri packageRoot = script.resolve('./packages/');
 
+  MemorySourceFileProvider.MEMORY_SOURCE_FILES = MEMORY_SOURCE_FILES;
   var provider = new MemorySourceFileProvider();
   var handler = new FormattingDiagnosticHandler(provider);