AAPT2: Cleanup Visitors for XML and Values

Test: make aapt2_tests
Change-Id: Ib61f64c155a380115610edeaf2d65e60258a2426
diff --git a/tools/aapt2/cmd/Optimize.cpp b/tools/aapt2/cmd/Optimize.cpp
index 33a1d3a..704faee 100644
--- a/tools/aapt2/cmd/Optimize.cpp
+++ b/tools/aapt2/cmd/Optimize.cpp
@@ -18,6 +18,7 @@
 #include <vector>
 
 #include "android-base/stringprintf.h"
+
 #include "androidfw/ResourceTypes.h"
 #include "androidfw/StringPiece.h"