Move web modal dialog manager files into the constrained_window component.

components/web_modal/test_web_contents_modal_dialog_manager_views.cc

-// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// 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.
 
 #include "components/web_modal/web_contents_modal_dialog_manager.h"
 
-#include "chrome/browser/ui/views/native_web_contents_modal_dialog_manager_views.h"
 #include "components/web_modal/single_web_contents_dialog_manager.h"
+#include "components/web_modal/test_web_contents_modal_dialog_manager_delegate.h"
 
 namespace web_modal {
 
 SingleWebContentsDialogManager*
 WebContentsModalDialogManager::CreateNativeWebModalManager(
     gfx::NativeWindow dialog,
     SingleWebContentsDialogManagerDelegate* native_delegate) {
-  return new NativeWebContentsModalDialogManagerViews(dialog, native_delegate);
+  return nullptr;
 }
-
-}  // namespace web_modal
+}