Update //third_party/protobuf to version 3.

third_party/protobuf/src/google/protobuf/stubs/singleton.h

Index: third_party/protobuf/src/google/protobuf/stubs/singleton.h
diff --git a/third_party/protobuf/src/google/protobuf/compiler/cpp/cpp_options.h b/third_party/protobuf/src/google/protobuf/stubs/singleton.h
similarity index 67%
copy from third_party/protobuf/src/google/protobuf/compiler/cpp/cpp_options.h
copy to third_party/protobuf/src/google/protobuf/stubs/singleton.h
index 787706629bd10fc72eb7811d9498f19dd0524d11..9301f549b1d6f9eeb038472eb326190d4be0e30d 100644
--- a/third_party/protobuf/src/google/protobuf/compiler/cpp/cpp_options.h
+++ b/third_party/protobuf/src/google/protobuf/stubs/singleton.h
@@ -1,6 +1,6 @@
 // Protocol Buffers - Google's data interchange format
-// Copyright 2008 Google Inc.  All rights reserved.
-// http://code.google.com/p/protobuf/
+// Copyright 2014 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
@@ -27,32 +27,42 @@
 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+#ifndef GOOGLE_PROTOBUF_STUBS_SINGLETON_H__
+#define GOOGLE_PROTOBUF_STUBS_SINGLETON_H__
 
-// Author: rennie@google.com (Jeffrey Rennie)
-
-#ifndef GOOGLE_PROTOBUF_COMPILER_CPP_OPTIONS_H__
-#define GOOGLE_PROTOBUF_COMPILER_CPP_OPTIONS_H__
-
-#include <string>
-
+#include <google/protobuf/stubs/atomicops.h>
 #include <google/protobuf/stubs/common.h>
+#include <google/protobuf/stubs/once.h>
+
 namespace google {
 namespace protobuf {
-namespace compiler {
-namespace cpp {
-
-// Generator options:
-struct Options {
-  Options() : safe_boundary_check(false) {
+namespace internal {
+template<typename T>
+class Singleton {
+ public:
+  static T* get() {
+    GoogleOnceInit(&once_, &Singleton<T>::Init);
+    return instance_;
+  }
+  static void ShutDown() {
+    delete instance_;
+    instance_ = NULL;
   }
-  string dllexport_decl;
-  bool safe_boundary_check;
+ private:
+  static void Init() {
+    instance_ = new T();
+  }
+  static ProtobufOnceType once_;
+  static T* instance_;
 };
 
-}  // namespace cpp
-}  // namespace compiler
-}  // namespace protobuf
-
+template<typename T>
+ProtobufOnceType Singleton<T>::once_;
 
+template<typename T>
+T* Singleton<T>::instance_ = NULL;
+}  // namespace internal
+}  // namespace protobuf
 }  // namespace google
-#endif  // GOOGLE_PROTOBUF_COMPILER_CPP_OPTIONS_H__
+
+#endif  // GOOGLE_PROTOBUF_STUBS_SINGLETON_H__