Remove the java_host_runtime_alias polyfill.

Closes #5424.

Change-Id: I16bb70ffec9d541c56ed0579ae616407073d46f2
PiperOrigin-RevId: 203279412
diff --git a/tools/jdk/BUILD b/tools/jdk/BUILD
index b364df6..14699e1 100644
--- a/tools/jdk/BUILD
+++ b/tools/jdk/BUILD
@@ -1,8 +1,5 @@
 package(default_visibility = ["//visibility:public"])
 
-# TODO(lberki): Remove this once java_toolchain_alias and java_runtime_alias are
-# in a Bazel release
-load("//tools/jdk:alias_rules.bzl", "java_host_runtime_alias")
 load(
     "//tools/jdk:default_java_toolchain.bzl",
     "default_java_toolchain",
@@ -249,7 +246,6 @@
     srcs = [
         "BUILD-jdk",  # Tools are build from the workspace for tests.
         "DumpPlatformClassPath.java",
-        "alias_rules.bzl",
         "default_java_toolchain.bzl",
         "proguard_whitelister.py",
         "proguard_whitelister_test.py",
diff --git a/tools/jdk/alias_rules.bzl b/tools/jdk/alias_rules.bzl
deleted file mode 100644
index 134c1e8..0000000
--- a/tools/jdk/alias_rules.bzl
+++ /dev/null
@@ -1,29 +0,0 @@
-# Copyright 2017 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.
-
-def _java_host_runtime_alias_impl(ctx):
-    vars = ctx.attr._host_java_runtime[platform_common.TemplateVariableInfo]
-    runtime_info = ctx.attr._host_java_runtime[java_common.JavaRuntimeInfo]
-    runtime_toolchain = ctx.attr._host_java_runtime[platform_common.ToolchainInfo]
-    return struct(providers = [vars, runtime_info, runtime_toolchain])
-
-java_host_runtime_alias = rule(
-    attrs = {
-        "_host_java_runtime": attr.label(
-            default = Label("//tools/jdk:java_runtime_alias"),
-            cfg = "host",
-        ),
-    },
-    implementation = _java_host_runtime_alias_impl,
-)