Revert "Update the test runner to use the new dart:io API" again

tools/testing/dart/status_file_parser.dart

Index: tools/testing/dart/status_file_parser.dart
diff --git a/tools/testing/dart/status_file_parser.dart b/tools/testing/dart/status_file_parser.dart
index dc3d5fe4e475bfa30383061e0bbaa78807a89bb6..d314581fb6e18cef96dca3d1c213538304ad9941 100644
--- a/tools/testing/dart/status_file_parser.dart
+++ b/tools/testing/dart/status_file_parser.dart
@@ -4,7 +4,6 @@
 
 library status_file_parser;
 
-import "dart:async";
 import "dart:io";
 import "status_expression.dart";
 
@@ -66,45 +65,49 @@ void ReadConfigurationInto(path, sections, onDone) {
   if (!file.existsSync()) {
     throw new Exception('Cannot find test status file $path');
   }
-  Stream<String> lines =
-      file.openRead()
-          .transform(new StringDecoder())
-          .transform(new LineTransformer());
+  InputStream file_stream = file.openInputStream();
+  StringInputStream lines = new StringInputStream(file_stream);
 
   Section current = new Section.always();
   sections.add(current);
 
-  lines.listen((String line) {
-    Match match = StripComment.firstMatch(line);
-    line = (match == null) ? "" : match[0];
-    line = line.trim();
-    if (line.isEmpty) return;
-
-    match = HeaderPattern.firstMatch(line);
-    if (match != null) {
-      String condition_string = match[1].trim();
-      List<String> tokens = new Tokenizer(condition_string).tokenize();
-      ExpressionParser parser = new ExpressionParser(new Scanner(tokens));
-      current = new Section(parser.parseBooleanExpression());
-      sections.add(current);
-      return;
-    }
+  lines.onLine = () {
+    String line;
+    while ((line = lines.readLine()) != null) {
+      Match match = StripComment.firstMatch(line);
+      line = (match == null) ? "" : match[0];
+      line = line.trim();
+      if (line.isEmpty) continue;
+
+      match = HeaderPattern.firstMatch(line);
+      if (match != null) {
+        String condition_string = match[1].trim();
+        List<String> tokens = new Tokenizer(condition_string).tokenize();
+        ExpressionParser parser = new ExpressionParser(new Scanner(tokens));
+        current = new Section(parser.parseBooleanExpression());
+        sections.add(current);
+        continue;
+      }
 
-    match = RulePattern.firstMatch(line);
-    if (match != null) {
-      String name = match[1].trim();
-      // TODO(whesse): Handle test names ending in a wildcard (*).
-      String expression_string = match[2].trim();
-      List<String> tokens = new Tokenizer(expression_string).tokenize();
-      SetExpression expression =
-          new ExpressionParser(new Scanner(tokens)).parseSetExpression();
-      current.testRules.add(new TestRule(name, expression));
-      return;
+      match = RulePattern.firstMatch(line);
+      if (match != null) {
+        String name = match[1].trim();
+        // TODO(whesse): Handle test names ending in a wildcard (*).
+        String expression_string = match[2].trim();
+        List<String> tokens = new Tokenizer(expression_string).tokenize();
+        SetExpression expression =
+            new ExpressionParser(new Scanner(tokens)).parseSetExpression();
+        current.testRules.add(new TestRule(name, expression));
+        continue;
+      }
+
+      print("unmatched line: $line");
     }
+  };
 
-    print("unmatched line: $line");
-  },
-  onDone: onDone);
+  lines.onClosed = () {
+    onDone();
+  };
 }