Automated rollback of commit 7e48642.

*** Reason for rollback ***

Breaks presubmit https://buildkite.com/bazel/google-bazel-presubmit/builds/42622#10f51cb9-f2c5-4b09-bd04-01196a37aba9

*** Original change description ***

Attach local JDK to JVM8_TOOLCHAIN_CONFIGURATION.

This is a partial revert of ec29e28.
The commit support rules_appengine usecase, which needs to supply additional parameters to a toolchain compiling with JDK8.
Previously the whole commit broke repos that are using bazel-toolchains.

Caveat: the downstream still breaks rules_appengine on Java 11 only system (Ubuntu 18.04). I believe this is correct behavio...

***

PiperOrigin-RevId: 350780263

src/test/shell/bazel/bazel_java_test_defaults.sh

@@ -222,6 +222,7 @@ load("@bazel_tools//tools/jdk:default_java_toolchain.bzl", "default_java_toolcha
 default_java_toolchain(
   name = "jvm8_toolchain",
   configuration = JVM8_TOOLCHAIN_CONFIGURATION,
+  java_runtime = "@local_jdk//:jdk",
 )
 EOF
 

tools/jdk/BUILD.tools

@@ -467,10 +467,3 @@ java_runtime_version_alias(
     ),
     visibility = ["//visibility:public"],
 )
-
-java_runtime_version_alias(
-    name = "jdk_8",
-    runtime_version = "8",
-    selected_java_runtime = ":legacy_current_java_runtime",
-    visibility = ["//visibility:public"],
-)

tools/jdk/default_java_toolchain.bzl

@@ -15,7 +15,7 @@
 """Bazel rules for creating Java toolchains."""
 
 JDK8_JVM_OPTS = [
-    "-Xbootclasspath/p:$(location @remote_java_tools//:javac_jar)",
+    "-Xbootclasspath/p:$(location @bazel_tools//tools/jdk:javac_jar)",
 ]
 
 # JVM options, without patching java.compiler and jdk.compiler modules.
@@ -74,7 +74,6 @@ _BASE_TOOLCHAIN_CONFIGURATION = dict(
 JVM8_TOOLCHAIN_CONFIGURATION = dict(
     tools = ["@remote_java_tools//:javac_jar"],
     jvm_opts = ["-Xbootclasspath/p:$(location @remote_java_tools//:javac_jar)"],
-    java_runtime = "@bazel_tools//tools/jdk:jdk_8",
 )
 
 DEFAULT_TOOLCHAIN_CONFIGURATION = dict(