Don't close background pages if there is a pending response (callback).

chrome/renderer/extensions/extension_helper.cc

 // 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.
 
 #include "chrome/renderer/extensions/extension_helper.h"
 
 #include "base/command_line.h"
 #include "base/json/json_value_serializer.h"
 #include "base/lazy_instance.h"
 #include "base/message_loop.h"
@@ skipping 179 matching lines @@
     return;
 
   g_schedulers.Get()[frame] = new UserScriptIdleScheduler(
       frame, extension_dispatcher_);
 }
 
 void ExtensionHelper::OnExtensionResponse(int request_id,
                                           bool success,
                                           const std::string& response,
                                           const std::string& error) {
+  std::string extension_id;
   ExtensionProcessBindings::HandleResponse(
       extension_dispatcher_->v8_context_set(), request_id, success,
-      response, error);
+      response, error, &extension_id);
+
+  if (CommandLine::ForCurrentProcess()->HasSwitch(
+          switches::kEnableLazyBackgroundPages))
+    extension_dispatcher_->CheckIdleStatus(extension_id);
 }
 
 void ExtensionHelper::OnExtensionMessageInvoke(const std::string& extension_id,
                                                const std::string& function_name,
                                                const ListValue& args,
                                                const GURL& event_url) {
   extension_dispatcher_->v8_context_set().DispatchChromeHiddenMethod(
       extension_id, function_name, args, render_view(), event_url);
 }
 
@@ skipping 145 matching lines @@
       routing_id(), *pending_app_info_));
   pending_app_info_.reset(NULL);
 }
 
 void ExtensionHelper::AddErrorToRootConsole(const string16& message) {
   if (render_view()->GetWebView() && render_view()->GetWebView()->mainFrame()) {
     render_view()->GetWebView()->mainFrame()->addMessageToConsole(
         WebConsoleMessage(WebConsoleMessage::LevelError, message));
   }
 }