Remove deprecated java toolchain flags

Closes bazelbuild#14062.

PiperOrigin-RevId: 401054840

.bazelrc

@@ -34,16 +34,6 @@ build:ubuntu1604_java8 --host_platform=//:rbe_ubuntu1604_java8_platform
 build:ubuntu1604_java8 --platforms=//:rbe_ubuntu1604_java8_platform
 build:ubuntu1604_java8 --config=remote_shared
 
-#TODO(ilist): remove once Bazel version on RBE is > 4.0.0
-build:ubuntu1804_java11 --host_javabase=@rbe_ubuntu1804_java11//java:jdk
-build:ubuntu1804_java11 --javabase=@rbe_ubuntu1804_java11//java:jdk
-build:ubuntu1804_java11 --host_java_toolchain=@bazel_tools//tools/jdk:toolchain_java9
-build:ubuntu1804_java11 --java_toolchain=@bazel_tools//tools/jdk:toolchain_java9
-build:ubuntu1604_java8 --host_javabase=@rbe_ubuntu1604_java8//java:jdk
-build:ubuntu1604_java8 --javabase=@rbe_ubuntu1604_java8//java:jdk
-build:ubuntu1604_java8 --host_java_toolchain=@bazel_tools//tools/jdk:toolchain_hostjdk8
-build:ubuntu1604_java8 --java_toolchain=@bazel_tools//tools/jdk:toolchain_hostjdk8
-
 # Alias
 build:remote --config=ubuntu1604_java8