Automatically call TestingBuildParams.RelativeToTop()

Fixes the few tests that break due to this and which cannot easily be
separated into their own changes.

Bug: 183650682
Test: m nothing
Change-Id: Ia2f31213a1f114a78e66a81d89279ecde9f4c465
diff --git a/java/java_test.go b/java/java_test.go
index 2ade0fe..1d1a796 100644
--- a/java/java_test.go
+++ b/java/java_test.go
@@ -1670,7 +1670,7 @@
 
 	// The bar library should depend on the stubs jar.
 	barLibrary := result.ModuleForTests("bar", "android_common").Rule("javac")
-	if expected, actual := `^-classpath .*:/[^:]*/turbine-combined/foo\.stubs\.jar$`, barLibrary.Args["classpath"]; !regexp.MustCompile(expected).MatchString(actual) {
+	if expected, actual := `^-classpath .*:out/soong/[^:]*/turbine-combined/foo\.stubs\.jar$`, barLibrary.Args["classpath"]; !regexp.MustCompile(expected).MatchString(actual) {
 		t.Errorf("expected %q, found %#q", expected, actual)
 	}
 }
@@ -1973,7 +1973,7 @@
 		`)
 	// The baz library should depend on the system stubs jar.
 	bazLibrary := result.ModuleForTests("baz", "android_common").Rule("javac")
-	if expected, actual := `^-classpath .*:/[^:]*/turbine-combined/foo\.stubs.system\.jar$`, bazLibrary.Args["classpath"]; !regexp.MustCompile(expected).MatchString(actual) {
+	if expected, actual := `^-classpath .*:out/soong/[^:]*/turbine-combined/foo\.stubs.system\.jar$`, bazLibrary.Args["classpath"]; !regexp.MustCompile(expected).MatchString(actual) {
 		t.Errorf("expected %q, found %#q", expected, actual)
 	}
 }