PPAPI: Get TrackedCallback ready for running on non-main threads.

ppapi/proxy/ppb_flash_device_id_proxy.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 "ppapi/proxy/ppb_flash_device_id_proxy.h"
 
 #include "base/compiler_specific.h"
 #include "ppapi/c/pp_errors.h"
 #include "ppapi/proxy/plugin_dispatcher.h"
 #include "ppapi/proxy/plugin_globals.h"
@@ skipping 66 matching lines @@
           pp_resource()));
   return PP_OK_COMPLETIONPENDING;
 }
 
 void DeviceID::OnReply(int32_t result, const std::string& id) {
   if (result == PP_OK)
     *dest_ = StringVar::StringToPPVar(id);
   else
     *dest_ = PP_MakeUndefined();
   dest_ = NULL;
-  TrackedCallback::ClearAndRun(&callback_, result);
+  callback_->Run(result);
 }
 
 }  // namespace
 
 PPB_Flash_DeviceID_Proxy::PPB_Flash_DeviceID_Proxy(Dispatcher* dispatcher)
     : InterfaceProxy(dispatcher) {
 }
 
 PPB_Flash_DeviceID_Proxy::~PPB_Flash_DeviceID_Proxy() {
 }
@@ skipping 19 matching lines @@
                                                    int32 result,
                                                    const std::string& id) {
   thunk::EnterResourceNoLock<PPB_Flash_DeviceID_API> enter(resource, false);
   if (enter.failed())
     return;  // Resource destroyed.
   static_cast<DeviceID*>(enter.object())->OnReply(result, id);
 }
 
 }  // namespace proxy
 }  // namespace ppapi