Update //third_party/protobuf to version 3.

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

 // 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
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 // notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 // copyright notice, this list of conditions and the following disclaimer
 // in the documentation and/or other materials provided with the
 // distribution.
 //     * Neither the name of Google Inc. nor the names of its
 // contributors may be used to endorse or promote products derived from
 // this software without specific prior written permission.
 //
 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 // 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)
+#include <google/protobuf/stubs/atomicops.h>
+#include <google/protobuf/stubs/common.h>
+#include <google/protobuf/stubs/once.h>
 
-#ifndef GOOGLE_PROTOBUF_COMPILER_CPP_OPTIONS_H__
-#define GOOGLE_PROTOBUF_COMPILER_CPP_OPTIONS_H__
-
-#include <string>
-
-#include <google/protobuf/stubs/common.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_;
   }
-  string dllexport_decl;
-  bool safe_boundary_check;
+  static void ShutDown() {
+    delete instance_;
+    instance_ = NULL;
+  }
+ private:
+  static void Init() {
+    instance_ = new T();
+  }
+  static ProtobufOnceType once_;
+  static T* instance_;
 };
 
-}  // namespace cpp
-}  // namespace compiler
+template<typename T>
+ProtobufOnceType Singleton<T>::once_;
+
+template<typename T>
+T* Singleton<T>::instance_ = NULL;
+}  // namespace internal
 }  // namespace protobuf
+}  // namespace google
 
-
-}  // namespace google
-#endif  // GOOGLE_PROTOBUF_COMPILER_CPP_OPTIONS_H__
+#endif  // GOOGLE_PROTOBUF_STUBS_SINGLETON_H__