Mojo C++ bindings: disallow copy and assign for generated classes when necessary.

mojo/public/interfaces/bindings/tests/test_export.mojom

+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+module mojo.test.test_export;
+
+struct StringPair {
+  string s1;
+  string s2;
+};
+
+// This is a regression test. On Windows, if we export the generated class *and*
+// not explicitly disallow copy constructor and assign operator, compilation
+// will fail because it tries to use copy constructor of
+// InlinedStructPtr<StringPair>.
+struct StringPairContainer {
+  array<StringPair> pairs;
+};