Update third_party/protobuf to protobuf-v3.0.0-beta-3

third_party/protobuf/cmake/libprotoc.cmake

 set(libprotoc_files
   ${protobuf_source_dir}/src/google/protobuf/compiler/code_generator.cc
   ${protobuf_source_dir}/src/google/protobuf/compiler/command_line_interface.cc
   ${protobuf_source_dir}/src/google/protobuf/compiler/cpp/cpp_enum.cc
   ${protobuf_source_dir}/src/google/protobuf/compiler/cpp/cpp_enum_field.cc
   ${protobuf_source_dir}/src/google/protobuf/compiler/cpp/cpp_extension.cc
   ${protobuf_source_dir}/src/google/protobuf/compiler/cpp/cpp_field.cc
   ${protobuf_source_dir}/src/google/protobuf/compiler/cpp/cpp_file.cc
   ${protobuf_source_dir}/src/google/protobuf/compiler/cpp/cpp_generator.cc
   ${protobuf_source_dir}/src/google/protobuf/compiler/cpp/cpp_helpers.cc
@@ skipping 19 matching lines @@
   ${protobuf_source_dir}/src/google/protobuf/compiler/csharp/csharp_repeated_primitive_field.cc
   ${protobuf_source_dir}/src/google/protobuf/compiler/csharp/csharp_source_generator_base.cc
   ${protobuf_source_dir}/src/google/protobuf/compiler/csharp/csharp_wrapper_field.cc
   ${protobuf_source_dir}/src/google/protobuf/compiler/java/java_context.cc
   ${protobuf_source_dir}/src/google/protobuf/compiler/java/java_doc_comment.cc
   ${protobuf_source_dir}/src/google/protobuf/compiler/java/java_enum.cc
   ${protobuf_source_dir}/src/google/protobuf/compiler/java/java_enum_field.cc
   ${protobuf_source_dir}/src/google/protobuf/compiler/java/java_enum_field_lite.cc
   ${protobuf_source_dir}/src/google/protobuf/compiler/java/java_enum_lite.cc
   ${protobuf_source_dir}/src/google/protobuf/compiler/java/java_extension.cc
+  ${protobuf_source_dir}/src/google/protobuf/compiler/java/java_extension_lite.cc
   ${protobuf_source_dir}/src/google/protobuf/compiler/java/java_field.cc
   ${protobuf_source_dir}/src/google/protobuf/compiler/java/java_file.cc
   ${protobuf_source_dir}/src/google/protobuf/compiler/java/java_generator.cc
   ${protobuf_source_dir}/src/google/protobuf/compiler/java/java_generator_factory.cc
   ${protobuf_source_dir}/src/google/protobuf/compiler/java/java_helpers.cc
   ${protobuf_source_dir}/src/google/protobuf/compiler/java/java_lazy_message_field.cc
   ${protobuf_source_dir}/src/google/protobuf/compiler/java/java_lazy_message_field_lite.cc
   ${protobuf_source_dir}/src/google/protobuf/compiler/java/java_map_field.cc
   ${protobuf_source_dir}/src/google/protobuf/compiler/java/java_map_field_lite.cc
   ${protobuf_source_dir}/src/google/protobuf/compiler/java/java_message.cc
@@ skipping 46 matching lines @@
 target_link_libraries(libprotoc libprotobuf)
 if(MSVC AND protobuf_BUILD_SHARED_LIBS)
   target_compile_definitions(libprotoc
     PUBLIC  PROTOBUF_USE_DLLS
     PRIVATE LIBPROTOC_EXPORTS)
 endif()
 set_target_properties(libprotoc PROPERTIES
     COMPILE_DEFINITIONS LIBPROTOC_EXPORTS
     OUTPUT_NAME ${LIB_PREFIX}protoc
     DEBUG_POSTFIX "${protobuf_DEBUG_POSTFIX}")