Update //third_party/protobuf to version 3.

third_party/protobuf/src/google/protobuf/compiler/cpp/cpp_enum.h

 // 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
 // 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
@@ skipping 14 matching lines @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 // Author: kenton@google.com (Kenton Varda)
 //  Based on original Protocol Buffers design by
 //  Sanjay Ghemawat, Jeff Dean, and others.
 
 #ifndef GOOGLE_PROTOBUF_COMPILER_CPP_ENUM_H__
 #define GOOGLE_PROTOBUF_COMPILER_CPP_ENUM_H__
 
+#include <set>
 #include <string>
 #include <google/protobuf/compiler/cpp/cpp_options.h>
 #include <google/protobuf/descriptor.h>
 
 
 namespace google {
 namespace protobuf {
   namespace io {
     class Printer;             // printer.h
   }
 }
 
 namespace protobuf {
 namespace compiler {
 namespace cpp {
 
 class EnumGenerator {
  public:
   // See generator.cc for the meaning of dllexport_decl.
   explicit EnumGenerator(const EnumDescriptor* descriptor,
                          const Options& options);
   ~EnumGenerator();
 
   // Header stuff.
 
+  // Fills the name to use when declaring the enum. This is for use when
+  // generating other .proto.h files. This code should be placed within the
+  // enum's package namespace, but NOT within any class, even for nested
+  // enums.
+  void FillForwardDeclaration(set<string>* enum_names);
+
   // Generate header code defining the enum.  This code should be placed
   // within the enum's package namespace, but NOT within any class, even for
   // nested enums.
   void GenerateDefinition(io::Printer* printer);
 
   // Generate specialization of GetEnumDescriptor<MyEnum>().
   // Precondition: in ::google::protobuf namespace.
   void GenerateGetEnumDescriptorSpecializations(io::Printer* printer);
 
   // For enums nested within a message, generate code to import all the enum's
   // symbols (e.g. the enum type name, all its values, etc.) into the class's
   // namespace.  This should be placed inside the class definition in the
   // header.
   void GenerateSymbolImports(io::Printer* printer);
 
   // Source file stuff.
 
   // Generate code that initializes the global variable storing the enum's
   // descriptor.
   void GenerateDescriptorInitializer(io::Printer* printer, int index);
 
   // Generate non-inline methods related to the enum, such as IsValidValue().
   // Goes in the .cc file.
   void GenerateMethods(io::Printer* printer);
 
  private:
   const EnumDescriptor* descriptor_;
   string classname_;
   Options options_;
+  // whether to generate the *_ARRAYSIZE constant.
+  bool generate_array_size_;
 
   GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(EnumGenerator);
 };
 
 }  // namespace cpp
 }  // namespace compiler
 }  // namespace protobuf
 
 }  // namespace google
 #endif  // GOOGLE_PROTOBUF_COMPILER_CPP_ENUM_H__