MD Bookmarks: Disable 'Open in Incognito Window' when Incognito is disabled

chrome/browser/ui/webui/md_bookmarks/md_bookmarks_ui.cc

 // Copyright (c) 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/webui/md_bookmarks/md_bookmarks_ui.h"
 
 #include <algorithm>
+#include <string>
 
 #include "base/strings/string16.h"
 #include "chrome/browser/profiles/profile.h"
+#include "chrome/browser/ui/webui/md_bookmarks/bookmarks_message_handler.h"
 #include "chrome/common/chrome_features.h"
 #include "chrome/common/url_constants.h"
 #include "chrome/grit/browser_resources.h"
 #include "chrome/grit/generated_resources.h"
 #include "components/strings/grit/components_strings.h"
 #include "content/public/browser/web_ui.h"
 #include "content/public/browser/web_ui_data_source.h"
 #include "ui/base/l10n/l10n_util.h"
 
 namespace {
@@ skipping 124 matching lines @@
   return source;
 }
 
 }  // namespace
 
 MdBookmarksUI::MdBookmarksUI(content::WebUI* web_ui) : WebUIController(web_ui) {
   // Set up the chrome://bookmarks/ source.
   Profile* profile = Profile::FromWebUI(web_ui);
   content::WebUIDataSource::Add(profile,
                                 CreateMdBookmarksUIHTMLSource(profile));
+
+  web_ui->AddMessageHandler(base::MakeUnique<BookmarksMessageHandler>());
 }
 
 // static
 bool MdBookmarksUI::IsEnabled() {
   return base::FeatureList::IsEnabled(features::kMaterialDesignBookmarks);
 }