Reverts third_party/protobuf: Update to HEAD (f52e188fe4)

third_party/protobuf/src/google/protobuf/stubs/atomicops_internals_x86_msvc.cc

 // Protocol Buffers - Google's data interchange format
 // Copyright 2012 Google Inc.  All rights reserved.
 // https://developers.google.com/protocol-buffers/
 //
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 // notice, this list of conditions and the following disclaimer.
@@ skipping 26 matching lines @@
 #include <google/protobuf/stubs/atomicops.h>
 
 #ifdef GOOGLE_PROTOBUF_ATOMICOPS_INTERNALS_X86_MSVC_H_
 
 #include <windows.h>
 
 namespace google {
 namespace protobuf {
 namespace internal {
 
-inline void MemoryBarrierInternal() {
-  // On ARM this is a define while on x86/x64 this is
-  // a function declared in WinNT.h
-  MemoryBarrier();
+inline void MemoryBarrier() {
+  // We use MemoryBarrier from WinNT.h
+  ::MemoryBarrier();
 }
 
 Atomic32 NoBarrier_CompareAndSwap(volatile Atomic32* ptr,
                                   Atomic32 old_value,
                                   Atomic32 new_value) {
   LONG result = InterlockedCompareExchange(
       reinterpret_cast<volatile LONG*>(ptr),
       static_cast<LONG>(new_value),
       static_cast<LONG>(old_value));
   return static_cast<Atomic32>(result);
@@ skipping 43 matching lines @@
 }
 
 #endif  // defined(_WIN64)
 
 }  // namespace internal
 }  // namespace protobuf
 }  // namespace google
 
 #endif  // GOOGLE_PROTOBUF_ATOMICOPS_INTERNALS_X86_MSVC_H_
 #endif  // GOOGLE_PROTOBUF_NO_THREAD_SAFETY