Use InterstitialPage through a delegate interface instead of deriving from it.

chrome/browser/renderer_host/offline_resource_handler.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/renderer_host/offline_resource_handler.h"
 
 #include <vector>
 
 #include "base/bind.h"
 #include "base/logging.h"
@@ skipping 31 matching lines @@
         BrowserThread::IO, FROM_HERE, base::Bind(callback, true));
   } else {
     RenderViewHost* render_view_host =
         RenderViewHost::FromID(render_process_id, render_view_id);
     WebContents* web_contents = render_view_host ?
         render_view_host->delegate()->GetAsWebContents() : NULL;
     // There is a chance that the tab closed after we decided to show
     // the offline page on the IO thread and before we actually show the
     // offline page here on the UI thread.
     if (web_contents)
-      (new chromeos::OfflineLoadPage(web_contents, url, callback))->Show();
+      new chromeos::OfflineLoadPage(web_contents, url, callback);
   }
 }
 
 }  // namespace
 
 OfflineResourceHandler::OfflineResourceHandler(
     ResourceHandler* handler,
     int host_id,
     int route_id,
     ResourceDispatcherHost* rdh,
@@ skipping 153 matching lines @@
   const GURL url = deferred_url_;
   int request_id = deferred_request_id_;
   ClearRequestInfo();
 
   bool defer = false;
   DVLOG(1) << "Resume load: this=" << this << ", request id=" << request_id;
   next_handler_->OnWillStart(request_id, url, &defer);
   if (!defer)
     rdh_->StartDeferredRequest(process_host_id_, request_id);
 }