Keep NaCl plugins used in app background pages alive when active.

content/browser/ppapi_plugin_process_host.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 CONTENT_BROWSER_PPAPI_PLUGIN_PROCESS_HOST_H_
 #define CONTENT_BROWSER_PPAPI_PLUGIN_PROCESS_HOST_H_
 
 #include <queue>
 #include <vector>
 
@@ skipping 124 matching lines @@
 
   void CancelRequests();
 
   // IPC message handlers.
   void OnRendererPluginChannelCreated(const IPC::ChannelHandle& handle);
 
   // Handles most requests from the plugin. May be NULL.
   scoped_refptr<PepperMessageFilter> filter_;
 
   ppapi::PpapiPermissions permissions_;
-  scoped_ptr<BrowserPpapiHostImpl> host_impl_;
+  scoped_refptr<BrowserPpapiHostImpl> host_impl_;
 
   // Observes network changes. May be NULL.
   scoped_ptr<PluginNetworkObserver> network_observer_;
 
   // Channel requests that we are waiting to send to the plugin process once
   // the channel is opened.
   std::vector<Client*> pending_requests_;
 
   // Channel requests that we have already sent to the plugin process, but
   // haven't heard back about yet.
@@ skipping 27 matching lines @@
  public:
   PpapiBrokerProcessHostIterator()
       : BrowserChildProcessHostTypeIterator<
           PpapiPluginProcessHost>(PROCESS_TYPE_PPAPI_BROKER) {}
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_PPAPI_PLUGIN_PROCESS_HOST_H_