Use ScopedRefNPObject to pass NPObjects in the host plugin.

remoting/host/plugin/host_script_object.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 REMOTING_HOST_PLUGIN_HOST_SCRIPT_OBJECT_H_
 #define REMOTING_HOST_PLUGIN_HOST_SCRIPT_OBJECT_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 194 matching lines @@
                       string16* result);
 
   // If the web-app has registered a callback to be notified of changes to the
   // NAT traversal policy, notify it.
   void UpdateWebappNatPolicy(bool nat_traversal_enabled);
 
   //////////////////////////////////////////////////////////
   // Helper methods for Me2Me host.
 
   // Helpers for GenerateKeyPair().
-  void DoGenerateKeyPair(NPObject* callback);
-  void InvokeGenerateKeyPairCallback(NPObject* callback,
+  void DoGenerateKeyPair(const ScopedRefNPObject& callback);
+  void InvokeGenerateKeyPairCallback(const ScopedRefNPObject& callback,
                                      const std::string& private_key,
                                      const std::string& public_key);
 
 
   // Callback handler for SetConfigAndStart(), Stop() and SetPin() in
   // DaemonController.
-  void InvokeAsyncResultCallback(NPObject* callback,
+  void InvokeAsyncResultCallback(const ScopedRefNPObject& callback,
                                  DaemonController::AsyncResult result);
 
   // Callback handler for DaemonController::GetConfig().
-  void InvokeGetDaemonConfigCallback(NPObject* callback,
+  void InvokeGetDaemonConfigCallback(const ScopedRefNPObject& callback,
                                      scoped_ptr<base::DictionaryValue> config);
 
   //////////////////////////////////////////////////////////
   // Basic helper methods used for both It2Me and Me2me.
 
   // Call LogDebugInfo handler if there is one.
   // This must be called on the correct thread.
   void LogDebugInfo(const std::string& message);
 
   // Helper function for executing InvokeDefault on an NPObject, and ignoring
@@ skipping 70 matching lines @@
   // SequencedWorkerPool. Problem is that SequencedWorkerPool relies
   // on MessageLoopProxy::current().
   base::Thread worker_thread_;
 
   DISALLOW_COPY_AND_ASSIGN(HostNPScriptObject);
 };
 
 }  // namespace remoting
 
 #endif  // REMOTING_HOST_PLUGIN_HOST_SCRIPT_OBJECT_H_