Migrated test block 29 to Dart 2.0

tests/corelib_2/string_test.dart

Index: tests/corelib_2/string_test.dart
diff --git a/tests/corelib_strong/string_test.dart b/tests/corelib_2/string_test.dart
similarity index 97%
rename from tests/corelib_strong/string_test.dart
rename to tests/corelib_2/string_test.dart
index d51d88df59637c3d9200e5c27f4348d03eaaf236..f66f16b672d809be0c9b2820c0319e56c03575a6 100644
--- a/tests/corelib_strong/string_test.dart
+++ b/tests/corelib_2/string_test.dart
@@ -6,7 +6,6 @@ import "package:expect/expect.dart";
 
 void main() {
   testOutOfRange();
-  testIllegalArgument();
   testConcat();
   testIndex();
   testCodeUnitAt();
@@ -43,21 +42,6 @@ void testOutOfRange() {
   Expect.isTrue(exception_caught);
 }
 
-void testIllegalArgument() {
-  String a = "Hello";
-  bool exception_caught = false;
-  try {
-    var c = a[2.2]; // Throw exception.
-    Expect.fail("Accepting double as index");
-  } on ArgumentError catch (e) {
-    exception_caught = true;
-  } on TypeError catch (e) {
-    // Thrown in checked mode only.
-    exception_caught = true;
-  }
-  Expect.isTrue(exception_caught);
-}
-
 void testIndex() {
   String str = "string";
   for (int i = 0; i < str.length; i++) {