Re-apply "Remove unittest and matcher from the repo."

pkg/unittest/lib/src/configuration.dart

Index: pkg/unittest/lib/src/configuration.dart
diff --git a/pkg/unittest/lib/src/configuration.dart b/pkg/unittest/lib/src/configuration.dart
deleted file mode 100644
index ca901328cdc3e32cdd7652bd9d13059b3b38d93f..0000000000000000000000000000000000000000
--- a/pkg/unittest/lib/src/configuration.dart
+++ /dev/null
@@ -1,69 +0,0 @@
-// Copyright (c) 2013, 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 file.
-
-library unittest.configuration;
-
-import 'package:unittest/unittest.dart' show TestCase, SimpleConfiguration;
-
-/// Describes the interface used by the unit test system for communicating the
-/// results of a test run.
-abstract class Configuration {
-
-  /// Creates an instance of [SimpleConfiguration].
-  factory Configuration() => new SimpleConfiguration();
-
-  /// Creates an [Configuration] instances that does nothing.
-  ///
-  /// For use by subclasses which wish to implement only a subset of features.
-  Configuration.blank();
-
-  /// If [:true:], tests are started automatically. Otherwise [runTests]
-  /// must be called explicitly after tests are set up.
-  bool get autoStart => true;
-
-  /// How long a [TestCase] can run before it is considered an error.
-  /// A [timeout] value of [:null:] means that the limit is infinite.
-  Duration timeout = const Duration(minutes: 2);
-
-  /// Called as soon as the unittest framework becomes initialized.
-  ///
-  /// This is done even before tests are added to the test framework. It might
-  /// be used to determine/debug errors that occur before the test harness
-  /// starts executing. It is also used to tell the vm or browser that tests are
-  /// going to be run asynchronously and that the process should wait until they
-  /// are done.
-  void onInit() {}
-
-  /// Called as soon as the unittest framework starts running.
-  void onStart() {}
-
-  /// Called when each test starts. Useful to show intermediate progress on
-  /// a test suite.
-  void onTestStart(TestCase testCase) {}
-
-  /// Called when each test is first completed. Useful to show intermediate
-  /// progress on a test suite.
-  void onTestResult(TestCase testCase) {}
-
-  /// Called when an already completed test changes state. For example: a test
-  /// that was marked as passing may later be marked as being in error because
-  /// it still had callbacks being invoked.
-  void onTestResultChanged(TestCase testCase) {}
-
-  /// Handles the logging of messages by a test case.
-  void onLogMessage(TestCase testCase, String message) {}
-
-  /// Called when the unittest framework is done running. [success] indicates
-  /// whether all tests passed successfully.
-  void onDone(bool success) {}
-
-  /// Called with the result of all test cases. Browser tests commonly override
-  /// this to reformat the output.
-  ///
-  /// When [uncaughtError] is not null, it contains an error that occured outside
-  /// of tests (e.g. setting up the test).
-  void onSummary(int passed, int failed, int errors, List<TestCase> results,
-      String uncaughtError) {}
-}
-