Pass result of blockage across content API when new tab blocked.

ui/web_dialogs/web_dialog_web_contents_delegate.cc

 // Copyright (c) 2012 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 "ui/web_dialogs/web_dialog_web_contents_delegate.h"
 
 #include "base/logging.h"
 #include "content/public/browser/web_contents.h"
 
 using content::BrowserContext;
@@ skipping 21 matching lines @@
 
 void WebDialogWebContentsDelegate::Detach() {
   browser_context_ = NULL;
 }
 
 WebContents* WebDialogWebContentsDelegate::OpenURLFromTab(
     WebContents* source, const OpenURLParams& params) {
   return handler_->OpenURLFromTab(browser_context_, source, params);
 }
 
-void WebDialogWebContentsDelegate::AddNewContents(
+bool WebDialogWebContentsDelegate::AddNewContents(
     WebContents* source, WebContents* new_contents,
     WindowOpenDisposition disposition, const gfx::Rect& initial_pos,
     bool user_gesture) {
-  handler_->AddNewContents(browser_context_, source, new_contents, disposition,
-                           initial_pos, user_gesture);
+  return handler_->AddNewContents(browser_context_, source, new_contents,
+                                  disposition, initial_pos, user_gesture);
 }
 
 bool WebDialogWebContentsDelegate::IsPopupOrPanel(
     const WebContents* source) const {
   // This needs to return true so that we are allowed to be resized by our
   // contents.
   return true;
 }
 
 bool WebDialogWebContentsDelegate::ShouldAddNavigationToHistory(
     const history::HistoryAddPageArgs& add_page_args,
     content::NavigationType navigation_type) {
   return false;
 }
 
 }  // namespace ui