rewrite_to_chrome_style: Avoid asserts when checking for const-ness.

tools/clang/rewrite_to_chrome_style/tests/template-original.cc

+// 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.
+
+namespace blink {
+
+template <typename T, int number>
+void F() {
+  // We don't assert on this, and we don't end up considering it a const for
+  // now.
+  const int maybe_a_const = sizeof(T);
+  const int is_a_const = number;
+}
+
+template <int number, typename... T>
+void F() {
+  // We don't assert on this, and we don't end up considering it a const for
+  // now.
+  const int maybe_a_const = sizeof...(T);
+  const int is_a_const = number;
+}
+
+}  // namespace blink