Revert https://codereview.chromium.org/1291903002 (protobuf roll).

third_party/protobuf/src/google/protobuf/compiler/main.cc

Index: third_party/protobuf/src/google/protobuf/compiler/main.cc
diff --git a/third_party/protobuf/src/google/protobuf/compiler/main.cc b/third_party/protobuf/src/google/protobuf/compiler/main.cc
index 4815a726fac8a83e7f41c217ee9c8c8f8c90100c..1afc5d611130c70a812c41cbc6e848e45616b269 100644
--- a/third_party/protobuf/src/google/protobuf/compiler/main.cc
+++ b/third_party/protobuf/src/google/protobuf/compiler/main.cc
@@ -1,6 +1,6 @@
 // Protocol Buffers - Google's data interchange format
 // Copyright 2008 Google Inc.  All rights reserved.
-// https://developers.google.com/protocol-buffers/
+// http://code.google.com/p/protobuf/
 //
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
@@ -34,10 +34,7 @@
 #include <google/protobuf/compiler/cpp/cpp_generator.h>
 #include <google/protobuf/compiler/python/python_generator.h>
 #include <google/protobuf/compiler/java/java_generator.h>
-#include <google/protobuf/compiler/javanano/javanano_generator.h>
-#include <google/protobuf/compiler/ruby/ruby_generator.h>
-#include <google/protobuf/compiler/csharp/csharp_generator.h>
-#include <google/protobuf/compiler/objectivec/objectivec_generator.h>
+
 
 int main(int argc, char* argv[]) {
 
@@ -60,25 +57,5 @@ int main(int argc, char* argv[]) {
   cli.RegisterGenerator("--python_out", &py_generator,
                         "Generate Python source file.");
 
-  // Java Nano
-  google::protobuf::compiler::javanano::JavaNanoGenerator javanano_generator;
-  cli.RegisterGenerator("--javanano_out", &javanano_generator,
-                        "Generate Java Nano source file.");
-
-  // Ruby
-  google::protobuf::compiler::ruby::Generator rb_generator;
-  cli.RegisterGenerator("--ruby_out", &rb_generator,
-                        "Generate Ruby source file.");
-
-  // CSharp
-  google::protobuf::compiler::csharp::Generator csharp_generator;
-  cli.RegisterGenerator("--csharp_out", &csharp_generator,
-                        "Generate C# source file.");
-
-  // Objective C
-  google::protobuf::compiler::objectivec::ObjectiveCGenerator objc_generator;
-  cli.RegisterGenerator("--objc_out", &objc_generator,
-                        "Generate Objective C header and source.");
-
   return cli.Run(argc, argv);
 }