Address comments.

- Fix sanit test check_bazel_workspace.py.
- Use the new `grpc_extra_deps` in the Bazel workspace test.

bazel/test/python_test_repo/WORKSPACE

@@ -4,17 +4,9 @@ local_repository(
 )
 
 load("@com_github_grpc_grpc//bazel:grpc_deps.bzl", "grpc_deps")
-grpc_deps()
-
-load("@com_google_protobuf//:protobuf_deps.bzl", "protobuf_deps")
-protobuf_deps()
 
-# TODO(https://github.com/grpc/grpc/issues/19835): Remove.
+grpc_deps()
-load("@upb//bazel:workspace_deps.bzl", "upb_deps")
-upb_deps()
 
-load("@build_bazel_rules_apple//apple:repositories.bzl", "apple_rules_dependencies")
+load("@com_github_grpc_grpc//bazel:grpc_extra_deps.bzl", "grpc_extra_deps")
-apple_rules_dependencies()
 
-load("@build_bazel_apple_support//lib:repositories.bzl", "apple_support_dependencies")
+grpc_extra_deps()
-apple_support_dependencies()

tools/run_tests/sanity/check_bazel_workspace.py

@@ -64,6 +64,7 @@ _GRPC_DEP_NAMES = [
     _TWISTED_CONSTANTLY_DEP_NAME,
     'io_bazel_rules_go',
     'build_bazel_rules_apple',
+    'build_bazel_apple_support',
 ]
 
 _GRPC_BAZEL_ONLY_DEPS = [
@@ -79,6 +80,7 @@ _GRPC_BAZEL_ONLY_DEPS = [
     _TWISTED_CONSTANTLY_DEP_NAME,
     'io_bazel_rules_go',
     'build_bazel_rules_apple',
+    'build_bazel_apple_support',
 ]