dart2js: run dartfmt on tests

tests/compiler/dart2js/memory_source_file_helper.dart

 // Copyright (c) 2013, 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 dart2js.test.memory_source_file_helper;
 
 import 'dart:async' show Future;
 export 'dart:io' show Platform;
 
-export 'package:compiler/src/apiimpl.dart'
-       show CompilerImpl;
+export 'package:compiler/src/apiimpl.dart' show CompilerImpl;
 
-export 'package:compiler/src/filenames.dart'
-       show currentDirectory;
+export 'package:compiler/src/filenames.dart' show currentDirectory;
 
 import 'package:compiler/src/io/source_file.dart'
-       show StringSourceFile, SourceFile;
+    show StringSourceFile, SourceFile;
 
-import 'package:compiler/src/source_file_provider.dart'
-       show SourceFileProvider;
+import 'package:compiler/src/source_file_provider.dart' show SourceFileProvider;
 
 export 'package:compiler/src/source_file_provider.dart'
-       show SourceFileProvider, FormattingDiagnosticHandler;
+    show SourceFileProvider, FormattingDiagnosticHandler;
 
 class MemorySourceFileProvider extends SourceFileProvider {
   Map<String, String> memorySourceFiles;
 
   MemorySourceFileProvider(Map<String, String> this.memorySourceFiles);
 
   Future<String> readStringFromUri(Uri resourceUri) {
     if (resourceUri.scheme != 'memory') {
       return super.readStringFromUri(resourceUri);
     }
@@ skipping 17 matching lines @@
     if (source == null) {
       throw new Exception(
           'No such memory file $resourceUri in ${memorySourceFiles.keys}');
     }
     return new StringSourceFile.fromUri(resourceUri, source);
   }
 
   @override
   Future readFromUri(Uri resourceUri) => readStringFromUri(resourceUri);
 }