Switch from using 'nacl_main' to 'main' entry point

ports/libgit2-demo/libgit2-demo.c

 /* Copyright 2014 The Native Client 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 "operations.h"
 
 #include <alloca.h>
 #include <assert.h>
 #include <errno.h>
 #include <git2.h>
 #include <git2/transport.h>
-#include <nacl_main.h>
 #include <string.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <sys/mount.h>
 #include <sys/stat.h>
 #include <ppapi/c/pp_errors.h>
 #include <ppapi/c/pp_var.h>
 #include <ppapi/c/ppb_messaging.h>
 #include <ppapi/c/ppb_var_array.h>
 #include <ppapi/c/ppb_var.h>
@@ skipping 100 matching lines @@
   }
 
   handle_cmd(cmd, repo_directory, arg);
 }
 
 git_smart_subtransport_definition pepper_http_subtransport_definition = {
     git_smart_subtransport_pepper_http,
     1 /* use rpc */
 };
 
-int nacl_main(int argc, char** argv) {
+int main(int argc, char** argv) {
   srand(123);
   int rtn = git_threads_init();
   if (rtn) {
     output("git_threads_init failed: %d\n", rtn);
     return 1;
   }
 
   rtn = git_smart_subtransport_pepper_http_init(PSGetInstanceId(),
                                                 PSGetInterface);
   if (rtn) {
@@ skipping 19 matching lines @@
   PSEventSetFilter(PSE_INSTANCE_HANDLEMESSAGE);
   while (1) {
     PSEvent* event = PSEventWaitAcquire();
     if (event->type != PSE_INSTANCE_HANDLEMESSAGE)
       output("unexpected message type: %d\n", event->type);
     handle_message(event->as_var);
     PSEventRelease(event);
   }
   return 0;
 }