Remove java_toolchain auto-selection based on --server_javabase

PiperOrigin-RevId: 214538144

tools/jdk/BUILD

diff --git a/tools/jdk/BUILD b/tools/jdk/BUILD
index 585596c..dd57b35 100644
--- a/tools/jdk/BUILD
+++ b/tools/jdk/BUILD
@@ -228,7 +228,7 @@
 # Default to the Java 8 language level.
 # TODO(cushon): consider if/when we should increment this?
 default_java_toolchain(
-    name = "toolchain_hostjdk9",
+    name = "toolchain",
     bootclasspath = [":platformclasspath"],
     jvm_opts = JDK9_JVM_OPTS,
     source_version = "8",
@@ -267,11 +267,6 @@
     for release in RELEASES
 ]
 
-alias(
-    name = "toolchain",
-    actual = "//external:java_toolchain",
-)
-
 filegroup(
     name = "srcs",
     srcs = [