Update //third_party/protobuf to version 3.

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

Index: third_party/protobuf/src/google/protobuf/stubs/once.cc
diff --git a/third_party/protobuf/src/google/protobuf/stubs/once.cc b/third_party/protobuf/src/google/protobuf/stubs/once.cc
index 2363622e330e344bcf9983497a6f7da65947ebe9..9667b44393f8671e619f88aceab4f1367ff77d69 100644
--- a/third_party/protobuf/src/google/protobuf/stubs/once.cc
+++ b/third_party/protobuf/src/google/protobuf/stubs/once.cc
@@ -1,6 +1,6 @@
 // Protocol Buffers - Google's data interchange format
 // Copyright 2008 Google Inc.  All rights reserved.
-// http://code.google.com/p/protobuf/
+// 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
@@ -62,6 +62,13 @@ void SchedYield() {
 
 }  // namespace
 
+void GoogleOnceInit(ProtobufOnceType* once, void (*init_func)()) {
+  if (internal::Acquire_Load(once) != ONCE_STATE_DONE) {
+    internal::FunctionClosure0 func(init_func, false);
+    GoogleOnceInitImpl(once, &func);
+  }
+}
+
 void GoogleOnceInitImpl(ProtobufOnceType* once, Closure* closure) {
   internal::AtomicWord state = internal::Acquire_Load(once);
   // Fast path. The provided closure was already executed.
@@ -93,13 +100,6 @@ void GoogleOnceInitImpl(ProtobufOnceType* once, Closure* closure) {
   }
 }
 
-void GoogleOnceInit(ProtobufOnceType* once, void (*init_func)()) {
-  if (internal::Acquire_Load(once) != ONCE_STATE_DONE) {
-    internal::FunctionClosure0 func(init_func, false);
-    GoogleOnceInitImpl(once, &func);
-  }
-}
-
 }  // namespace protobuf
 }  // namespace google