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

chrome/browser/ui/gtk/tabs/dragged_tab_controller_gtk.h

 // 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.
 
 #ifndef CHROME_BROWSER_UI_GTK_TABS_DRAGGED_TAB_CONTROLLER_GTK_H_
 #define CHROME_BROWSER_UI_GTK_TABS_DRAGGED_TAB_CONTROLLER_GTK_H_
 
 #include <gtk/gtk.h>
 
 #include <set>
@@ skipping 71 matching lines @@
   };
 
   DraggedTabData InitDraggedTabData(TabGtk* tab);
 
   // Overridden from content::WebContentsDelegate:
   virtual content::WebContents* OpenURLFromTab(
     content::WebContents* source,
     const content::OpenURLParams& params) OVERRIDE;
   virtual void NavigationStateChanged(const content::WebContents* source,
                                       unsigned changed_flags) OVERRIDE;
-  virtual void AddNewContents(content::WebContents* source,
+  virtual bool AddNewContents(content::WebContents* source,
                               content::WebContents* new_contents,
                               WindowOpenDisposition disposition,
                               const gfx::Rect& initial_pos,
                               bool user_gesture) OVERRIDE;
   virtual void LoadingStateChanged(content::WebContents* source) OVERRIDE;
   virtual content::JavaScriptDialogCreator*
       GetJavaScriptDialogCreator() OVERRIDE;
 
   // Overridden from content::NotificationObserver:
   virtual void Observe(int type,
@@ skipping 156 matching lines @@
 
   // Timer used to bring the window under the cursor to front. If the user
   // stops moving the mouse for a brief time over a browser window, it is
   // brought to front.
   base::OneShotTimer<DraggedTabControllerGtk> bring_to_front_timer_;
 
   DISALLOW_COPY_AND_ASSIGN(DraggedTabControllerGtk);
 };
 
 #endif  // CHROME_BROWSER_UI_GTK_TABS_DRAGGED_TAB_CONTROLLER_GTK_H_