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

ppapi/nacl_irt/plugin_startup.h

 // 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.
 
 #ifndef PPAPI_NACL_IRT_PLUGIN_STARTUP_H_
 #define PPAPI_NACL_IRT_PLUGIN_STARTUP_H_
 
 #include "ppapi/proxy/ppapi_proxy_export.h"
 
 namespace base {
 class Thread;
 class WaitableEvent;
 }  // namespace base
 
 namespace ppapi {
 
 class ManifestService;
 
 // Sets the IPC channels for the browser and the renderer by the given FD
-// numbers. This will be used for non-SFI mode. Must be called before
-// PpapiPluginMain is called.
+// numbers. This will be used for non-SFI mode. Must be called before the
+// ppapi_start() IRT interface is called.
 PPAPI_PROXY_EXPORT void SetIPCFileDescriptors(
     int browser_ipc_fd, int renderer_ipc_fd, int manifest_service_fd);
 
 // Runs start up procedure for the plugin.
 // Specifically, start background IO thread for IPC, and prepare
 // shutdown event instance.
 PPAPI_PROXY_EXPORT void StartUpPlugin();
 
 // Returns IPC file descriptor for PPAPI to the browser.
 int GetBrowserIPCFileDescriptor();
@@ skipping 10 matching lines @@
 
 // Returns the ManifestService interface. To use this, manifest_service_fd
 // needs to be set via SetIPCFileDescriptors. Must be called after
 // StartUpPlugin().
 // If not available, returns NULL.
 ManifestService* GetManifestService();
 
 }  // namespace ppapi
 
 #endif  // PPAPI_NACL_IRT_PLUGIN_STARTUP_H_