Move global_descriptors to base/posix.

ipc/ipc_multiprocess_test.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 "build/build_config.h"
 
 #include "ipc/ipc_multiprocess_test.h"
 
 #if defined(OS_POSIX)
-#include "base/global_descriptors_posix.h"
+#include "base/posix/global_descriptors.h"
 #include "ipc/ipc_descriptors.h"
 #endif
 
 void MultiProcessTestIPCSetUp() {
 #if defined(OS_POSIX)
   base::GlobalDescriptors::GetInstance()->Set(kPrimaryIPCChannel,
       kPrimaryIPCChannel + base::GlobalDescriptors::kBaseDescriptor);
 #endif
 }