Never lock the Pepper proxy lock on the IO thread

ppapi/nacl_irt/plugin_main.cc

 // Copyright 2014 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/nacl_irt/plugin_main.h"
 
 #include "build/build_config.h"
 // Need to include this before most other files because it defines
 // IPC_MESSAGE_LOG_ENABLED. We need to use it to define
 // IPC_MESSAGE_MACROS_LOG_ENABLED so ppapi_messages.h will generate the
 // ViewMsgLog et al. functions.
 
 #include "base/message_loop/message_loop.h"
 #include "base/threading/thread.h"
 #include "ipc/ipc_logging.h"
 #include "ppapi/nacl_irt/plugin_startup.h"
 #include "ppapi/nacl_irt/ppapi_dispatcher.h"
 #include "ppapi/proxy/plugin_globals.h"
 #include "ppapi/shared_impl/ppb_audio_shared.h"
 
 void PpapiPluginRegisterThreadCreator(
     const struct PP_ThreadFunctions* thread_functions) {
   // Initialize all classes that need to create threads that call back into
   // user code.
   ppapi::PPB_Audio_Shared::SetThreadFunctions(thread_functions);
 }
 
 int PpapiPluginMain() {
   base::MessageLoop loop;
-  ppapi::proxy::PluginGlobals plugin_globals;
+  ppapi::proxy::PluginGlobals plugin_globals(
+      scoped_refptr<base::TaskRunner>(
+          ppapi::GetIOThread()->message_loop_proxy()));
 
   ppapi::PpapiDispatcher ppapi_dispatcher(
       ppapi::GetIOThread()->message_loop_proxy(),
       ppapi::GetShutdownEvent(),
       ppapi::GetBrowserIPCFileDescriptor(),
       ppapi::GetRendererIPCFileDescriptor());
   plugin_globals.SetPluginProxyDelegate(&ppapi_dispatcher);
 
   loop.Run();
 
   return 0;
 }