Relocating files in the nacl repo that belong in chrome.

ppapi/native_client/src/untrusted/irt_stub/ppapi_plugin_main.c

+/*
+ * Copyright (c) 2011 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 "native_client/src/untrusted/irt_stub/ppapi_start.h"
+
+/*
+ * These are dangling references to functions that the application must define.
+ */
+static const struct PP_StartFunctions ppapi_app_start_callbacks = {
+  PPP_InitializeModule,
+  PPP_ShutdownModule,
+  PPP_GetInterface
+};
+
+/*
+ * The application's main (or the one supplied in this library) calls this
+ * to start the PPAPI world.
+ */
+int PpapiPluginMain(void) {
+  return PpapiPluginStart(&ppapi_app_start_callbacks);
+}