Don't use GetAsTabContents. Send notifications from TabContentsView instead.

chrome/browser/notifications/balloon_host.h

 // 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.
 
 #ifndef CHROME_BROWSER_NOTIFICATIONS_BALLOON_HOST_H_
 #define CHROME_BROWSER_NOTIFICATIONS_BALLOON_HOST_H_
 #pragma once
 
 #include <string>
 #include <vector>
@@ skipping 53 matching lines @@
   // NotificationObserver override.
   virtual void Observe(NotificationType type,
                        const NotificationSource& source,
                        const NotificationDetails& details);
 
 
   // RenderViewHostDelegate::View methods. Only the ones for opening new
   // windows are currently implemented.
   virtual void CreateNewWindow(
       int route_id,
-      WindowContainerType window_container_type,
-      const string16& frame_name);
+      const ViewHostMsg_CreateWindow_Params& params);
   virtual void CreateNewWidget(int route_id, WebKit::WebPopupType popup_type) {}
   virtual void CreateNewFullscreenWidget(
       int route_id, WebKit::WebPopupType popup_type) {}
   virtual void ShowCreatedWindow(int route_id,
                                  WindowOpenDisposition disposition,
                                  const gfx::Rect& initial_pos,
                                  bool user_gesture);
   virtual void ShowCreatedWidget(int route_id,
                                  const gfx::Rect& initial_pos) {}
   virtual void ShowCreatedFullscreenWidget(int route_id) {}
@@ skipping 69 matching lines @@
   // rendering a page from an extension.
   scoped_ptr<ExtensionFunctionDispatcher> extension_function_dispatcher_;
 
   // A flag to enable DOM UI.
   bool enable_dom_ui_;
 
   NotificationRegistrar registrar_;
 };
 
 #endif  // CHROME_BROWSER_NOTIFICATIONS_BALLOON_HOST_H_