internal/importers/java: fix test

The recent change to specify the Java bootclasspath for the Java
importer wasn't propagated to the test. Fix that.

Change-Id: I740fb14e17b4406fe0ccf97d46f28852e0630b5d
Reviewed-on: https://go-review.googlesource.com/33393
Reviewed-by: David Crawshaw <crawshaw@golang.org>

internal/importers/java/java_test.go

@@ -43,7 +43,7 @@ func TestImport(t *testing.T) {
 		for _, m := range test.methods {
 			refs.Names[m.GoName] = struct{}{}
 		}
-		classes, err := Import("", refs)
+		classes, err := Import("", "", refs)
 		if err != nil {
 			t.Fatal(err)
 		}