Move global_descriptors to base/posix.

base/posix/global_descriptors.h

Index: base/posix/global_descriptors.h
diff --git a/base/global_descriptors_posix.h b/base/posix/global_descriptors.h
similarity index 94%
rename from base/global_descriptors_posix.h
rename to base/posix/global_descriptors.h
index 47399238530aff010812a661c738f36c0d7d8337..c7b9f87fa4b37a9a79a5fb99d90de6f68c738dbc 100644
--- a/base/global_descriptors_posix.h
+++ b/base/posix/global_descriptors.h
@@ -2,8 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef BASE_GLOBAL_DESCRIPTORS_POSIX_H_
-#define BASE_GLOBAL_DESCRIPTORS_POSIX_H_
+#ifndef BASE_POSIX_GLOBAL_DESCRIPTORS_H_
+#define BASE_POSIX_GLOBAL_DESCRIPTORS_H_
 
 #include "build/build_config.h"
 
@@ -67,4 +67,4 @@ class BASE_EXPORT GlobalDescriptors {
 
 }  // namespace base
 
-#endif  // BASE_GLOBAL_DESCRIPTORS_POSIX_H_
+#endif  // BASE_POSIX_GLOBAL_DESCRIPTORS_H_