Fix the proto rules conflict

examples/BUILD

@@ -16,7 +16,9 @@ licenses(["notice"])  # 3-clause BSD
 
 package(default_visibility = ["//visibility:public"])
 
+load("@grpc_python_dependencies//:requirements.bzl", "requirement")
 load("//bazel:grpc_build_system.bzl", "grpc_proto_library")
+load("@org_pubref_rules_protobuf//python:rules.bzl", "py_proto_library")
 
 grpc_proto_library(
     name = "auth_sample",
@@ -43,6 +45,13 @@ grpc_proto_library(
     srcs = ["protos/keyvaluestore.proto"],
 )
 
+py_proto_library(
+    name = "py_helloworld",
+    protos = ["protos/helloworld.proto"],
+    with_grpc = True,
+    deps = [requirement('protobuf'),],
+)
+
 cc_binary(
     name = "greeter_client",
     srcs = ["cpp/helloworld/greeter_client.cc"],

examples/protos/BUILD.bazel

@@ -1,25 +0,0 @@
-# Copyright 2019 The gRPC Authors
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#     http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-
-load("@grpc_python_dependencies//:requirements.bzl", "requirement")
-load("@org_pubref_rules_protobuf//python:rules.bzl", "py_proto_library")
-
-package(default_visibility = ["//visibility:public"])
-
-py_proto_library(
-    name = "py_helloworld_proto",
-    protos = ["helloworld.proto",],
-    with_grpc = True,
-    deps = [requirement('protobuf'),],
-)

examples/python/errors/BUILD.bazel

@@ -13,7 +13,6 @@
 # limitations under the License.
 
 load("@grpc_python_dependencies//:requirements.bzl", "requirement")
-load("@org_pubref_rules_protobuf//python:rules.bzl", "py_proto_library")
 
 py_library(
     name = "client",
@@ -22,7 +21,7 @@ py_library(
     deps = [
         "//src/python/grpcio/grpc:grpcio",
         "//src/python/grpcio_status/grpc_status:grpc_status",
-        "//examples/protos:py_helloworld_proto",
+        "//examples:py_helloworld",
         requirement('googleapis-common-protos'),
     ],
 )
@@ -34,7 +33,7 @@ py_library(
     deps = [
         "//src/python/grpcio/grpc:grpcio",
         "//src/python/grpcio_status/grpc_status:grpc_status",
-        "//examples/protos:py_helloworld_proto",
+        "//examples:py_helloworld",
     ] + select({
         "//conditions:default": [requirement("futures")],
         "//:python3": [],