Ensure that systemserverclasspath_fragment does not depend on prebuilts

Bug: 190037398
Test: m nothing
Change-Id: I85671613c70bbfe8adde1d24d7f59ed7b53a8120

java/systemserver_classpath_fragment.go

@@ -119,6 +119,11 @@ type systemServerClasspathFragmentContentDependencyTag struct {
 	blueprint.BaseDependencyTag
 }
 
+// The systemserverclasspath_fragment contents must never depend on prebuilts.
+func (systemServerClasspathFragmentContentDependencyTag) ReplaceSourceWithPrebuilt() bool {
+	return false
+}
+
 // Contents of system server fragments in an apex are considered to be directly in the apex, as if
 // they were listed in java_libs.
 func (systemServerClasspathFragmentContentDependencyTag) CopyDirectlyInAnyApex() {}