Revert "Fix #28740 demangle constructors in stack traces (A.A becomes new A)."

tests/language/stacktrace_demangle_ctors_test.dart

-// Copyright (c) 2017, 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.
-
-// Test that stack traces are properly demangled in constructors (#28740).
-
-import "package:expect/expect.dart";
-
-class SomeClass {
-  SomeClass.namedConstructor() {
-    throw new Exception();
-  }
-
-  SomeClass() {
-    throw new Exception();
-  }
-
-  factory SomeClass.useFactory() {
-    throw new Exception();
-  }
-}
-
-class OnlyHasFactory {
-  factory OnlyHasFactory() {
-    throw new Exception();
-  }
-}
-
-void main() {
-  try {
-    new SomeClass();
-  } on Exception catch (e, st) {
-    final stString = st.toString();
-    Expect.isTrue(stString.contains("new SomeClass"));
-    Expect.isFalse(stString.contains("SomeClass."));
-  }
-
-  try {
-    new SomeClass.namedConstructor();
-  } on Exception catch (e, st) {
-    final stString = st.toString();
-    Expect.isTrue(stString.contains("new SomeClass.namedConstructor"));
-  }
-
-  try {
-    new OnlyHasFactory();
-  } on Exception catch (e, st) {
-    final stString = st.toString();
-    Expect.isTrue(stString.contains("new OnlyHasFactory"));
-    Expect.isFalse(stString.contains("OnlyHasFactory."));
-  }
-
-  try {
-    new SomeClass.useFactory();
-  } on Exception catch (e, st) {
-    final stString = st.toString();
-    Expect.isTrue(stString.contains("new SomeClass.useFactory"));
-  }
-}