base/threading: fix a potential race issue on start_event_

base/threading/platform_thread_posix.cc

 // 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 "base/threading/platform_thread.h"
 
 #include <errno.h>
 #include <pthread.h>
 #include <sched.h>
 #include <sys/resource.h>
@@ skipping 82 matching lines @@
 
   if (stack_size > 0)
     pthread_attr_setstacksize(&attributes, stack_size);
 
   scoped_ptr<ThreadParams> params(new ThreadParams);
   params->delegate = delegate;
   params->joinable = joinable;
   params->priority = priority;
 
   pthread_t handle;
-  int err =
-      pthread_create(&handle, &attributes, ThreadFunc, params.get());
+  int err = pthread_create(&handle, &attributes, ThreadFunc, params.get());
   bool success = !err;
   if (success) {
     // ThreadParams should be deleted on the created thread after used.
     ignore_result(params.release());
   } else {
     // Value of |handle| is undefined if pthread_create fails.
     handle = 0;
     errno = err;
     PLOG(ERROR) << "pthread_create";
   }
@@ skipping 137 matching lines @@
     return ThreadPriority::NORMAL;
   }
 
   return internal::NiceValueToThreadPriority(nice_value);
 #endif  // !defined(OS_NACL)
 }
 
 #endif  // !defined(OS_MACOSX)
 
 }  // namespace base