Remove use of deprecated java_toolchain to fix builds with Bazel master (#1324)

* Remove use of deprecated java_toolchain to fix builds with Bazel master

Author: liucijus

test/shell/test_toolchain.sh

@@ -11,7 +11,7 @@ test_scalaopts_from_scala_toolchain() {
 java_toolchain_javacopts_are_used(){
   action_should_fail_with_message \
     "invalid flag: -InvalidFlag" \
-    build --java_toolchain=//test_expect_failure/compilers_javac_opts:a_java_toolchain \
+    build --javacopt="-InvalidFlag" \
       --verbose_failures //test_expect_failure/compilers_javac_opts:can_configure_jvm_flags_for_javac_via_javacopts
 }
 

test_expect_failure/compilers_javac_opts/BUILD

@@ -1,13 +1,6 @@
 load("//scala:scala.bzl", "scala_library")
-load("@bazel_tools//tools/jdk:default_java_toolchain.bzl", "default_java_toolchain")
 
 scala_library(
     name = "can_configure_jvm_flags_for_javac_via_javacopts",
     srcs = ["WillNotCompileSinceJavaToolchainAddsAnInvalidJvmFlag.java"],
 )
-
-default_java_toolchain(
-    name = "a_java_toolchain",
-    javacopts = ["-InvalidFlag"],
-    visibility = ["//visibility:public"],
-)