Use the local JDK as the default target javabase

and continue to use the embedded JDK as the default host_javabase.

PiperOrigin-RevId: 196471714
diff --git a/src/test/java/com/google/devtools/build/lib/skyframe/TimestampBuilderTestCase.java b/src/test/java/com/google/devtools/build/lib/skyframe/TimestampBuilderTestCase.java
index e80ec31..56ada85 100644
--- a/src/test/java/com/google/devtools/build/lib/skyframe/TimestampBuilderTestCase.java
+++ b/src/test/java/com/google/devtools/build/lib/skyframe/TimestampBuilderTestCase.java
@@ -175,6 +175,7 @@
         new BlazeDirectories(
             new ServerDirectories(rootDirectory, outputBase, outputBase),
             rootDirectory,
+            /* defaultSystemJavabase= */ null,
             TestConstants.PRODUCT_NAME);
     ExternalFilesHelper externalFilesHelper = ExternalFilesHelper.createForTesting(
         pkgLocator,