Revert "Delete app jit or aot snapshots as each test is completed to reduce the amount of disk spac…

tools/testing/dart/test_runner.dart

Index: tools/testing/dart/test_runner.dart
diff --git a/tools/testing/dart/test_runner.dart b/tools/testing/dart/test_runner.dart
index 0641fbe3065c96f0de34edc9c84447f1c5eb0f94..1680066f6a7c925f9256b86ee68383bb108f5f1b 100644
--- a/tools/testing/dart/test_runner.dart
+++ b/tools/testing/dart/test_runner.dart
@@ -525,38 +525,6 @@ class CleanDirectoryCopyCommand extends ScriptCommand {
       _destinationDirectory == other._destinationDirectory;
 }
 
-class DeleteCommand extends ScriptCommand {
-  final String _filename;
-
-  DeleteCommand._(this._filename) : super._('delete');
-
-  String get reproductionCommand =>
-      "Deleting $_filename";
-
-  Future<ScriptCommandOutputImpl> run() {
-    var watch = new Stopwatch()..start();
-
-    var file = new io.File(_filename);
-
-    return file.delete(recursive: true).then((io.File file) {
-      return new ScriptCommandOutputImpl(
-          this, Expectation.PASS, "", watch.elapsed);
-    }).catchError((error) {
-      return new ScriptCommandOutputImpl(
-          this, Expectation.FAIL, "An error occured: $error.", watch.elapsed);
-    });
-  }
-
-  void _buildHashCode(HashCodeBuilder builder) {
-    super._buildHashCode(builder);
-    builder.addJson(_filename);
-  }
-
-  bool _equal(DeleteCommand other) =>
-      super._equal(other) &&
-      _filename == other._filename;
-}
-
 class ModifyPubspecYamlCommand extends ScriptCommand {
   String _pubspecYamlFile;
   String _destinationFile;
@@ -820,11 +788,6 @@ class CommandBuilder {
     return _getUniqueCommand(command);
   }
 
-  Command getDeleteCommand(String filename) {
-    var command = new DeleteCommand._(filename);
-    return _getUniqueCommand(command);
-  }
-
   Command getPubCommand(String pubCommand, String pubExecutable,
       String pubspecYamlDirectory, String pubCacheDirectory) {
     var command = new PubCommand._(