Fix the crash for the AudioShared.

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"
 
 #if defined(__native_client__)
 #include "native_client/src/shared/srpc/nacl_srpc.h"
 #endif
 
 void PpapiPluginRegisterThreadCreator(
     const struct PP_ThreadFunctions* thread_functions) {
-#if defined(__native_client__)
-  // TODO(hidehiko): The thread creation for the PPB_Audio is not yet
-  // implemented on non-SFI mode. Support this. Now, this function invocation
-  // is just ignored.
-
   // Initialize all classes that need to create threads that call back into
   // user code.
   ppapi::PPB_Audio_Shared::SetThreadFunctions(thread_functions);
-#endif
 }
 
 int PpapiPluginMain() {
   base::MessageLoop loop;
   ppapi::proxy::PluginGlobals plugin_globals;
 
 #if defined(__native_client__)
   // Currently on non-SFI mode, we don't use SRPC server on plugin.
   // TODO(hidehiko): Make sure this SRPC is actually used on SFI-mode.
 
@@ skipping 11 matching lines @@
       ppapi::GetIOThread()->message_loop_proxy(),
       ppapi::GetShutdownEvent(),
       ppapi::GetBrowserIPCFileDescriptor(),
       ppapi::GetRendererIPCFileDescriptor());
   plugin_globals.set_plugin_proxy_delegate(&ppapi_dispatcher);
 
   loop.Run();
 
   return 0;
 }