test rename overhaul: step 7 - corelib tests

tests/corelib/src/ExceptionImplementationTest.dart

-// Copyright (c) 2011, 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("ExceptionImplementationTest.dart");
-#import("dart:coreimpl");
-
-main() {
-  final msg = 1;
-  try {
-    throw new Exception(msg);
-    Expect.fail("Unreachable");
-  } catch (Exception e) {
-    Expect.isTrue(e is Exception);
-    Expect.isTrue(e is ExceptionImplementation);
-    Expect.equals("Exception: $msg", e.toString());
-  }
-}