Revert "third_party/protobuf: Update to HEAD (83d681ee2c)"

third_party/protobuf/cmake/tests.cmake

 if (NOT EXISTS "${PROJECT_SOURCE_DIR}/../gmock/CMakeLists.txt")
   message(FATAL_ERROR "Cannot find gmock directory.")
 endif()
 
 option(protobuf_ABSOLUTE_TEST_PLUGIN_PATH
   "Using absolute test_plugin path in tests" ON)
-mark_as_advanced(protobuf_ABSOLUTE_TEST_PLUGIN_PATH)
 
 include_directories(
   ${protobuf_source_dir}/gmock
   ${protobuf_source_dir}/gmock/gtest
   ${protobuf_source_dir}/gmock/gtest/include
   ${protobuf_source_dir}/gmock/include
 )
 
 add_library(gmock STATIC
   ${protobuf_source_dir}/gmock/src/gmock-all.cc
@@ skipping 38 matching lines @@
   google/protobuf/unittest_proto3_arena_lite.proto
   google/protobuf/unittest_proto3_lite.proto
   google/protobuf/unittest_well_known_types.proto
   google/protobuf/util/internal/testdata/anys.proto
   google/protobuf/util/internal/testdata/books.proto
   google/protobuf/util/internal/testdata/default_value.proto
   google/protobuf/util/internal/testdata/default_value_test.proto
   google/protobuf/util/internal/testdata/field_mask.proto
   google/protobuf/util/internal/testdata/maps.proto
   google/protobuf/util/internal/testdata/oneofs.proto
-  google/protobuf/util/internal/testdata/proto3.proto
   google/protobuf/util/internal/testdata/struct.proto
   google/protobuf/util/internal/testdata/timestamp_duration.proto
-  google/protobuf/util/internal/testdata/wrappers.proto
   google/protobuf/util/json_format_proto3.proto
   google/protobuf/util/message_differencer_unittest.proto
 )
 
 macro(compile_proto_file filename)
   get_filename_component(dirname ${filename} PATH)
   get_filename_component(basename ${filename} NAME_WE)
   add_custom_command(
     OUTPUT ${protobuf_source_dir}/src/${dirname}/${basename}.pb.cc
     DEPENDS protoc ${protobuf_source_dir}/src/${dirname}/${basename}.proto
@@ skipping 128 matching lines @@
 
 set(lite_arena_test_files
   ${protobuf_source_dir}/src/google/protobuf/lite_arena_unittest.cc
 )
 add_executable(lite-arena-test ${lite_arena_test_files} ${common_lite_test_files} ${lite_test_proto_files})
 target_link_libraries(lite-arena-test libprotobuf-lite gmock_main)
 
 add_custom_target(check
   COMMAND tests
   WORKING_DIRECTORY ${protobuf_source_dir})