Fix ART run-test 990-method-handle-and-mr with javac+dx.

Test: art/test/testrunner/testrunner.py -t 990-method-handle-and-mr (with ANDROID_COMPILE_WITH_JACK=false)
Bug: 37707231
Change-Id: Iec53475818e3bf140d2f5f6112c66e5246fc51bd
diff --git a/test/990-method-handle-and-mr/build b/test/990-method-handle-and-mr/build
index 5e5f36e..12a8e18 100755
--- a/test/990-method-handle-and-mr/build
+++ b/test/990-method-handle-and-mr/build
@@ -17,9 +17,4 @@
 # Exit on failure.
 set -e
 
-if [[ $@ != *"--jvm"* ]]; then
-  # Don't do anything with jvm.
-  export USE_JACK=true
-fi
-
 ./default-build "$@" --experimental method-handles