base: Set initial thread priority in ThreadFunc.

base/threading/platform_thread_mac.mm

 // 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"
 
 #import <Foundation/Foundation.h>
 #include <mach/mach.h>
 #include <mach/mach_time.h>
 #include <mach/thread_policy.h>
@@ skipping 198 matching lines @@
       stack_rlimit.rlim_cur != RLIM_INFINITY) {
     default_stack_size =
         std::max(std::max(default_stack_size,
                           static_cast<size_t>(PTHREAD_STACK_MIN)),
                  static_cast<size_t>(stack_rlimit.rlim_cur));
   }
   return default_stack_size;
 #endif
 }
 
-void InitOnThread() {
-}
-
 void TerminateOnThread() {
 }
 
 }  // namespace base