PPAPI/NaCl: Move plugin_main.cc's contents into irt_ppapi.cc

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/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(
-      scoped_refptr<base::TaskRunner>(ppapi::GetIOThread()->task_runner()));
-
-  ppapi::PpapiDispatcher ppapi_dispatcher(
-      ppapi::GetIOThread()->task_runner(), ppapi::GetShutdownEvent(),
-      ppapi::GetBrowserIPCFileDescriptor(),
-      ppapi::GetRendererIPCFileDescriptor());
-  plugin_globals.SetPluginProxyDelegate(&ppapi_dispatcher);
-
-  loop.Run();
-
-  return 0;
-}