scoped_refptr implicit conversion cleanup tool.

tools/clang/rewrite_scoped_refptr/tests/test6-expected.cc

+// Copyright (c) 2013 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.
+
+#include "scoped_refptr.h"
+
+struct Foo {
+  int dummy;
+};
+
+struct Bar : public Foo {
+  int another_dummy;
+};
+
+// Ensure that scoped_refptr<A> -> scoped_refptr<B> conversions are not
+// converted.
+void ExpectsScopedPtr(const scoped_refptr<Foo>& foo) {
+  scoped_refptr<Foo> temp(foo);
+}
+
+void CallExpectsScopedPtrWithBar() {
+  scoped_refptr<Bar> temp(new Bar);
+  ExpectsScopedPtr(temp);
+}