AAPT2: Cleanup Visitors for XML and Values

Test: make aapt2_tests
Change-Id: Ib61f64c155a380115610edeaf2d65e60258a2426
diff --git a/tools/aapt2/cmd/Link.cpp b/tools/aapt2/cmd/Link.cpp
index 3a2faa9..e3ee206d 100644
--- a/tools/aapt2/cmd/Link.cpp
+++ b/tools/aapt2/cmd/Link.cpp
@@ -33,6 +33,8 @@
 #include "Locale.h"
 #include "NameMangler.h"
 #include "ResourceUtils.h"
+#include "ResourceValues.h"
+#include "ValueVisitor.h"
 #include "cmd/Util.h"
 #include "compile/IdAssigner.h"
 #include "filter/ConfigFilter.h"