Update status files and expectations of rasta tests.

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

Index: pkg/front_end/lib/src/fasta/testing/kernel_chain.dart
diff --git a/pkg/front_end/lib/src/fasta/testing/kernel_chain.dart b/pkg/front_end/lib/src/fasta/testing/kernel_chain.dart
index ded157d032482d0b88bbdd526159be64b489d8cb..f5ecfdd538cac83983f61f80c07a62053c8cc2dc 100644
--- a/pkg/front_end/lib/src/fasta/testing/kernel_chain.dart
+++ b/pkg/front_end/lib/src/fasta/testing/kernel_chain.dart
@@ -247,6 +247,12 @@ class MatchExpectation extends Step<Program, Program, dynamic> {
     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();