message: Support new filenames for protoc.
diff: '<(protobuf_cpp_root)/wire_format_lite.cc',
  ],
  # Sources for protoc (common part and C++ generator only).
  + 'cpp': 'cpp_',
  'protoc_sources': [
  '<(protobuf_cpp_root)/any.cc',
  '<(protobuf_cpp_root)/any_lite.cc',
  '<(protobuf_cpp_root)/arenastring.cc',
  '<(protobuf_cpp_root)/compiler/code_generator.cc',
  '<(protobuf_cpp_root)/compiler/command_line_interface.cc',
  - '<(protobuf_cpp_root)/compiler/cpp/cpp_enum.cc',
  - '<(protobuf_cpp_root)/compiler/cpp/cpp_enum_field.cc',
  - '<(protobuf_cpp_root)/compiler/cpp/cpp_extension.cc',
  - '<(protobuf_cpp_root)/compiler/cpp/cpp_field.cc',
  - '<(protobuf_cpp_root)/compiler/cpp/cpp_file.cc',
  - '<(protobuf_cpp_root)/compiler/cpp/cpp_generator.cc',
  - '<(protobuf_cpp_root)/compiler/cpp/cpp_helpers.cc',
  - '<(protobuf_cpp_root)/compiler/cpp/cpp_map_field.cc',
  - '<(protobuf_cpp_root)/compiler/cpp/cpp_message.cc',
  - '<(protobuf_cpp_root)/compiler/cpp/cpp_message_field.cc',
  - '<(protobuf_cpp_root)/compiler/cpp/cpp_padding_optimizer.cc',
  - '<(protobuf_cpp_root)/compiler/cpp/cpp_parse_function_generator.cc',
  - '<(protobuf_cpp_root)/compiler/cpp/cpp_primitive_field.cc',
  - '<(protobuf_cpp_root)/compiler/cpp/cpp_service.cc',
  - '<(protobuf_cpp_root)/compiler/cpp/cpp_string_field.cc',
  + '<(protobuf_cpp_root)/compiler/cpp/<(cpp)enum.cc',
  + '<(protobuf_cpp_root)/compiler/cpp/<(cpp)enum_field.cc',
  + '<(protobuf_cpp_root)/compiler/cpp/<(cpp)extension.cc',
  + '<(protobuf_cpp_root)/compiler/cpp/<(cpp)field.cc',
  + '<(protobuf_cpp_root)/compiler/cpp/<(cpp)file.cc',
  + '<(protobuf_cpp_root)/compiler/cpp/<(cpp)generator.cc',
  + '<(protobuf_cpp_root)/compiler/cpp/<(cpp)helpers.cc',
  + '<(protobuf_cpp_root)/compiler/cpp/<(cpp)map_field.cc',
  + '<(protobuf_cpp_root)/compiler/cpp/<(cpp)message.cc',
  + '<(protobuf_cpp_root)/compiler/cpp/<(cpp)message_field.cc',
  + '<(protobuf_cpp_root)/compiler/cpp/<(cpp)padding_optimizer.cc',
  + '<(protobuf_cpp_root)/compiler/cpp/<(cpp)parse_function_generator.cc',
  + '<(protobuf_cpp_root)/compiler/cpp/<(cpp)primitive_field.cc',
  + '<(protobuf_cpp_root)/compiler/cpp/<(cpp)service.cc',
  + '<(protobuf_cpp_root)/compiler/cpp/<(cpp)string_field.cc',
  '<(protobuf_cpp_root)/compiler/importer.cc',
  '<(protobuf_cpp_root)/compiler/parser.cc',
  '<(protobuf_cpp_root)/compiler/plugin.cc',
  