Prevent popunders with the new auto-dismissing dialogs.

chrome/browser/ui/javascript_dialogs/javascript_dialog_views.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.
 
 #include "chrome/browser/ui/javascript_dialogs/javascript_dialog_views.h"
 
 #include "base/memory/ptr_util.h"
 #include "components/constrained_window/constrained_window_views.h"
 #include "ui/base/l10n/l10n_util.h"
 #include "ui/views/controls/message_box_view.h"
@@ skipping 81 matching lines @@
 
 JavaScriptDialogViews::JavaScriptDialogViews(
     content::WebContents* parent_web_contents,
     content::WebContents* alerting_web_contents,
     const base::string16& title,
     content::JavaScriptMessageType message_type,
     const base::string16& message_text,
     const base::string16& default_prompt_text,
     const content::JavaScriptDialogManager::DialogClosedCallback&
         dialog_callback)
-    : title_(title),
+    : JavaScriptDialog(parent_web_contents),
+      title_(title),
       message_type_(message_type),
       message_text_(message_text),
       default_prompt_text_(default_prompt_text),
       dialog_callback_(dialog_callback),
       weak_factory_(this) {
   int options = views::MessageBoxView::DETECT_DIRECTIONALITY;
   if (message_type == content::JAVASCRIPT_MESSAGE_TYPE_PROMPT)
     options |= views::MessageBoxView::HAS_PROMPT_FIELD;
 
   views::MessageBoxView::InitParams params(message_text);
   params.options = options;
   params.default_prompt = default_prompt_text;
   message_box_view_ = new views::MessageBoxView(params);
   DCHECK(message_box_view_);
 
   constrained_window::ShowWebModalDialogViews(this, parent_web_contents);
 }