Prepare for -Wall for third-party code, -Wextra for chromium_code

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

 /*
  * Copyright (c) 2012 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/native_client/src/untrusted/irt_stub/thread_creator.h"
 
 #include <pthread.h>
 
@@ skipping 12 matching lines @@
 
   return pthread_create((pthread_t *) tid, NULL,
                         (void *(*)(void *thread_argument)) func,
                         thread_argument);
 }
 
 static int thread_join(uintptr_t tid) {
   return pthread_join((pthread_t) tid, NULL);
 }
 
-const static struct PP_ThreadFunctions thread_funcs = {
+static const struct PP_ThreadFunctions thread_funcs = {
   thread_create,
   thread_join
 };
 
 /*
  * We cannot tell at link time whether the application uses PPB_Audio,
  * because of the way that PPAPI is defined via runtime interface
  * query rather than a set of static functions.  This means that we
  * register the audio thread functions unconditionally.  This adds the
  * small overhead of pulling in pthread_create() even if the
  * application does not use PPB_Audio or libpthread.
  *
  * If an application developer wants to avoid that cost, they can
  * override this function with an empty definition.
  */
 void __nacl_register_thread_creator(const struct nacl_irt_ppapihook *hooks) {
   hooks->ppapi_register_thread_creator(&thread_funcs);
 }