Remove cc_api_version stage 4: deletion where cc_api_version = 2

PiperOrigin-RevId: 669067740

Author: tfx-copybara

struct2tensor/proto/BUILD

@@ -9,7 +9,6 @@ licenses(["notice"])
 s2t_proto_library(
     name = "query_metadata_proto",
     srcs = ["query_metadata.proto"],
-    cc_api_version = 2,
     deps = ["@com_github_tensorflow_metadata//tensorflow_metadata/proto/v0:cc_metadata_v0_proto_cc"],
 )
 

struct2tensor/struct2tensor.bzl

@@ -31,8 +31,7 @@ def s2t_proto_library(
         deps = [],
         visibility = None,
         testonly = 0,
-        cc_grpc_version = None,
-        cc_api_version = 2):
+        cc_grpc_version = None):
     """Opensource proto_library.
 
     Args:
@@ -43,7 +42,6 @@ def s2t_proto_library(
       visibility: visibility constraints
       testonly: if true, only use in tests.
       cc_grpc_version: If set, use grpc plugin.
-      cc_api_version: The version of the API in C++.
     """
     _ignore = [has_services]
     native.filegroup(
@@ -61,7 +59,6 @@ def s2t_proto_library(
         name = name,
         srcs = srcs,
         deps = deps,
-        #cc_api_version = cc_api_version,
         cc_libs = ["@com_google_protobuf//:protobuf"],
         protoc = "@com_google_protobuf//:protoc",
         default_runtime = "@com_google_protobuf//:protobuf",

struct2tensor/test/BUILD

@@ -15,7 +15,6 @@ exports_files([
 s2t_proto_library(
     name = "test_proto",
     srcs = ["test.proto"],
-    cc_api_version = 2,
 )
 
 s2t_proto_library_cc(
@@ -35,7 +34,6 @@ s2t_proto_library_py(
 s2t_proto_library(
     name = "test_any_proto",
     srcs = ["test_any.proto"],
-    cc_api_version = 2,
     deps = ["@com_google_protobuf//:cc_wkt_protos"],
 )
 
@@ -54,7 +52,6 @@ s2t_proto_library_py(
 s2t_proto_library(
     name = "test_map_proto",
     srcs = ["test_map.proto"],
-    cc_api_version = 2,
 )
 
 s2t_proto_library_cc(
@@ -71,7 +68,6 @@ s2t_proto_library_py(
 s2t_proto_library(
     name = "test_proto3_proto",
     srcs = ["test_proto3.proto"],
-    cc_api_version = 2,
 )
 
 s2t_proto_library_py(