Relocating files in the nacl repo that belong in chrome.

ppapi/native_client/src/untrusted/irt_stub/plugin_main_irt.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/shared/ppapi_proxy/ppruntime.h"
+
+/*
+ * An application that doesn't define its own main but links in -lppapi
+ * gets this one.  A plugin may instead have its own main that calls
+ * PpapiPluginMain (or PpapiPluginStart) after doing some other setup.
+ */
+int main(void) {
+  return PpapiPluginMain();
+}