MacViews: Add a CreateChromeConstrainedWindowViewsClient stub

chrome/browser/ui/views/chrome_constrained_window_views_client_mac.cc

Index: chrome/browser/ui/views/chrome_constrained_window_views_client_mac.cc
diff --git a/chrome/browser/ui/views/chrome_constrained_window_views_client_mac.cc b/chrome/browser/ui/views/chrome_constrained_window_views_client_mac.cc
new file mode 100644
index 0000000000000000000000000000000000000000..142f45fbdc8ac6f60a9581054a0ae235fd5e6084
--- /dev/null
+++ b/chrome/browser/ui/views/chrome_constrained_window_views_client_mac.cc
@@ -0,0 +1,12 @@
+// Copyright 2014 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 "chrome/browser/ui/views/chrome_constrained_window_views_client.h"
+
+scoped_ptr<ConstrainedWindowViewsClient>
+CreateChromeConstrainedWindowViewsClient() {
+  // Mac toolkit-views doesn't use constrained windows yet.
+  // TODO(tapted): Delete this file when it does.
+  return nullptr;
+}