Revert "Port regexp tests from V8 to Dart."

tests/corelib/regexp/v8_regexp_utils.dart

Index: tests/corelib/regexp/v8_regexp_utils.dart
diff --git a/tests/corelib/regexp/v8_regexp_utils.dart b/tests/corelib/regexp/v8_regexp_utils.dart
deleted file mode 100644
index 3cd73b1ab8215f5513e85234ff048872c22778db..0000000000000000000000000000000000000000
--- a/tests/corelib/regexp/v8_regexp_utils.dart
+++ /dev/null
@@ -1,47 +0,0 @@
-// Copyright (c) 2014, 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.
-
-// Utility functions to easy porting of V8 tests.
-
-import "package:expect/expect.dart";
-
-void assertEquals(actual, expected, [message]) {
-  Expect.equals(actual, expected, message);
-}
-void assertTrue(actual, [message]) { Expect.isTrue(actual, message); }
-void assertFalse(actual, [message]) { Expect.isFalse(actual, message); }
-void assertThrows(fn, [testid]) { Expect.throws(fn, null, testid); }
-void assertNull(actual, [testid]) { Expect.isNull(actual, testid); }
-
-void assertToStringEquals(str, match, testid) {
-  var actual = [];
-  for (int i = 0; i <= match.groupCount; i++) {
-    actual.add(match.group(i));
-  }
-
-  Expect.equals(str,
-                actual.map((s) => (s == null) ? "" : s).join(","),
-                "Test $testid failed");
-}
-
-void shouldBeTrue(actual) { Expect.isTrue(actual); }
-void shouldBeFalse(actual) { Expect.isFalse(actual); }
-void shouldBeNull(actual) { Expect.isNull(actual); }
-
-void shouldBe(actual, expected, [message]) {
-  if (expected == null) {
-    Expect.isNull(actual);
-  } else {
-    Expect.equals(expected.length, actual.groupCount + 1);
-    for (int i = 0; i <= actual.groupCount; i++) {
-      Expect.equals(expected[i], actual.group(i));
-    }
-  }
-}
-
-Match firstMatch(String str, RegExp pattern) => pattern.firstMatch(str);
-List<String> allStringMatches(String str, RegExp pattern) =>
-    pattern.allMatches(str).map((Match m) => m.group(0)).toList();
-
-void description(str) { }