pkg/unittest: remove rerunTests

pkg/unittest/lib/unittest.dart

Index: pkg/unittest/lib/unittest.dart
diff --git a/pkg/unittest/lib/unittest.dart b/pkg/unittest/lib/unittest.dart
index 57f25812c9f8edabc456c86639fc31b0891ea391..969cbff34d7a33d4b4b98d9515804817455ceac4 100644
--- a/pkg/unittest/lib/unittest.dart
+++ b/pkg/unittest/lib/unittest.dart
@@ -299,11 +299,6 @@ void solo_test(String spec, TestFunction body) {
   }
 }
 
-/** Sentinel value for [_SpreadArgsHelper]. */
-class _Sentinel {
-  const _Sentinel();
-}
-
 /**
  * Indicate that [callback] is expected to be called a [count] number of times
  * (by default 1). The unittest framework will wait for the callback to run the
@@ -483,12 +478,6 @@ void handleExternalError(e, String message, [stack]) {
   }
 }
 
-void rerunTests() {
-  _uncaughtErrorMessage = null;
-  _initialized = true; // We don't want to reset the test array.
-  runTests();
-}
-
 /**
  * Filter the tests. [testFilter] can be a [RegExp], a [String] or a
  * predicate function. This is different to enabling/disabling tests