third_party/protobuf: Update to HEAD (f52e188fe4)

third_party/protobuf/src/google/protobuf/compiler/java/java_extension_lite.cc

 // Protocol Buffers - Google's data interchange format
 // Copyright 2008 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 39 matching lines @@
     scope_ = name_resolver_->GetImmutableClassName(
         descriptor_->extension_scope());
   } else {
     scope_ = name_resolver_->GetImmutableClassName(descriptor_->file());
   }
 }
 
 ImmutableExtensionLiteGenerator::~ImmutableExtensionLiteGenerator() {}
 
 void ImmutableExtensionLiteGenerator::Generate(io::Printer* printer) {
-  map<string, string> vars;
+  std::map<string, string> vars;
   const bool kUseImmutableNames = true;
   InitTemplateVars(descriptor_, scope_, kUseImmutableNames, name_resolver_,
                    &vars);
   printer->Print(vars,
       "public static final int $constant_name$ = $number$;\n");
 
   WriteFieldDocComment(printer, descriptor_);
   if (descriptor_->is_repeated()) {
     printer->Print(
         vars,
@@ skipping 38 matching lines @@
     "registry.add($scope$.$name$);\n",
     "scope", scope_,
     "name", UnderscoresToCamelCase(descriptor_));
   return 7;
 }
 
 }  // namespace java
 }  // namespace compiler
 }  // namespace protobuf
 }  // namespace google