Remove tools/build_defs/apple/apple.bzl.

PiperOrigin-RevId: 153589856
diff --git a/tools/build_defs/apple/test/apple_rule_test.bzl b/tools/build_defs/apple/test/apple_rule_test.bzl
deleted file mode 100644
index db0f345..0000000
--- a/tools/build_defs/apple/test/apple_rule_test.bzl
+++ /dev/null
@@ -1,45 +0,0 @@
-# Copyright 2016 The Bazel Authors. All rights reserved.
-#
-# 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.
-
-"""Tests for apple rules."""
-
-load(
-    "//tools/build_defs/apple:apple.bzl",
-    "swift_library",
-)
-load(
-    "//tools/build_rules:test_rules.bzl",
-    "rule_test",
-)
-
-
-def apple_rule_test():
-  """Issue simple tests on apple rules."""
-  swift_library(
-      name = "test_lib",
-      module_name = "test_lib",
-      srcs = ["source.swift"]
-  )
-
-  rule_test(
-      name = "simple_swift_library_test",
-      generates = ["test_lib/_objs/test_lib.a",
-                   "test_lib/_objs/test_lib.swiftmodule",
-                   "test_lib-Swift.h"],
-      provides = {
-          "swift": "",
-          "objc": ""
-      },
-      rule = ":test_lib",
-  )