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

chrome/browser/ui/gtk/web_dialog_gtk.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 "chrome/browser/ui/gtk/web_dialog_gtk.h"
 
 #include <gtk/gtk.h>
 
 #include "base/utf_string_conversions.h"
 #include "chrome/browser/ui/browser_dialogs.h"
@@ skipping 143 matching lines @@
     content::WebContents* source,
     const content::OpenURLParams& params) {
   content::WebContents* new_contents = NULL;
   if (delegate_ &&
       delegate_->HandleOpenURLFromTab(source, params, &new_contents)) {
     return new_contents;
   }
   return WebDialogWebContentsDelegate::OpenURLFromTab(source, params);
 }
 
-void WebDialogGtk::AddNewContents(content::WebContents* source,
+bool WebDialogGtk::AddNewContents(content::WebContents* source,
                                   content::WebContents* new_contents,
                                   WindowOpenDisposition disposition,
                                   const gfx::Rect& initial_pos,
                                   bool user_gesture) {
   if (delegate_ && delegate_->HandleAddNewContents(
           source, new_contents, disposition, initial_pos, user_gesture)) {
-    return;
+    return true;
   }
-  WebDialogWebContentsDelegate::AddNewContents(
+  return WebDialogWebContentsDelegate::AddNewContents(
       source, new_contents, disposition, initial_pos, user_gesture);
 }
 
 void WebDialogGtk::LoadingStateChanged(content::WebContents* source) {
   if (delegate_)
     delegate_->OnLoadingStateChanged(source);
 }
 
 bool WebDialogGtk::ShouldShowDialogTitle() const {
   return true;
@@ skipping 70 matching lines @@
   }
 
   gtk_widget_show_all(dialog_);
 
   return GTK_WINDOW(dialog_);
 }
 
 void WebDialogGtk::OnResponse(GtkWidget* dialog, int response_id) {
   OnDialogClosed(std::string());
 }