Add a blocking version of the sync promo dialog

chrome/browser/ui/webui/html_dialog_ui.cc

 // Copyright (c) 2011 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/html_dialog_ui.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/lazy_instance.h"
 #include "base/property_bag.h"
@@ skipping 88 matching lines @@
   // that are scoped in duration to the dialogs existence.
   web_ui->SetBindings(web_ui->GetBindings() & ~content::BINDINGS_POLICY_WEB_UI);
 }
 
 ExternalHtmlDialogUI::~ExternalHtmlDialogUI() {
 }
 
 bool HtmlDialogUIDelegate::HandleContextMenu(const ContextMenuParams& params) {
   return false;
 }
+
+bool HtmlDialogUIDelegate::HandleOpenURLFromTab(
+    content::WebContents* source,
+    const content::OpenURLParams& params,
+    content::WebContents** out_new_contents) {
+  return false;
+}
+
+bool HtmlDialogUIDelegate::HandleAddNewContents(
+    content::WebContents* source,
+    content::WebContents* new_contents,
+    WindowOpenDisposition disposition,
+    const gfx::Rect& initial_pos,
+    bool user_gesture) {
+  return false;
+}