Convert the PluginResource to be refcounted.

ppapi/proxy/ppb_input_event_proxy.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 "ppapi/proxy/ppb_input_event_proxy.h"
 
 #include "ppapi/c/ppb_audio_config.h"
 #include "ppapi/proxy/plugin_dispatcher.h"
 #include "ppapi/proxy/plugin_resource.h"
 #include "ppapi/proxy/plugin_var_tracker.h"
@@ skipping 103 matching lines @@
     false,
     &CreateInputEventProxy,
   };
   return &info;
 }
 
 // static
 PP_Resource PPB_InputEvent_Proxy::CreateProxyResource(
     PP_Instance instance,
     const InputEventData& data) {
-  linked_ptr<InputEvent> object(new InputEvent(
-      HostResource::MakeInstanceOnly(instance), data));
-  return PluginResourceTracker::GetInstance()->AddResource(object);
+  return PluginResourceTracker::GetInstance()->AddResource(
+      new InputEvent(HostResource::MakeInstanceOnly(instance), data));
 }
 
 bool PPB_InputEvent_Proxy::OnMessageReceived(const IPC::Message& msg) {
   // There are no IPC messages for this interface.
   NOTREACHED();
   return false;
 }
 
 }  // namespace proxy
 }  // namespace pp