Update status files and expectations of rasta tests.

pkg/front_end/lib/src/fasta/testing/kernel_chain.dart

 // Copyright (c) 2016, 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.md file.
 
 // TODO(ahe): Copied from closure_conversion branch of kernel, remove this file
 // when closure_conversion is merged with master.
 
 library kernel.testing.kernel_chain;
 
 import 'dart:async' show
@@ skipping 229 matching lines @@
 
   String get name => "match expectations";
 
   Future<Result<Program>> run(Program program, _) async {
     Library library = program.libraries.firstWhere(
         (Library library) => library.importUri.scheme != "dart");
     Uri uri = library.importUri;
     StringBuffer buffer = new StringBuffer();
     new Printer(buffer).writeLibraryFile(library);
 
+    bool updateExpectations = this.updateExpectations;
+    if (uri.path.contains("/test/rasta/")) {
+      // TODO(ahe): Remove this. Short term, we don't want to automatically
+      // update rasta expectations, as we have too many failures.
+      updateExpectations = false;
+    }
     File expectedFile = new File("${uri.toFilePath()}$suffix");
     if (await expectedFile.exists()) {
       String expected = await expectedFile.readAsString();
       if (expected.trim() != "$buffer".trim()) {
         if (!updateExpectations) {
           String diff = await runDiff(expectedFile.uri, "$buffer");
           return fail(null, "$uri doesn't match ${expectedFile.uri}\n$diff");
         }
       } else {
         return pass(program);
@@ skipping 119 matching lines @@
 
 Future openWrite(Uri uri, f(IOSink sink)) async {
   IOSink sink = new File.fromUri(uri).openWrite();
   try {
     await f(sink);
   } finally {
     await sink.close();
   }
   print("Wrote $uri");
 }