Use canonical UniquePtr.h header

Change-Id: Id50e9d6fe2f08d3121b168b45791a8e8fb045d7f

libs/minikin/FontFamily.cpp

@@ -19,10 +19,10 @@
 #include <cutils/log.h>
 #include <stdlib.h>
 #include <stdint.h>
-#include <utils/UniquePtr.h>
 #include <minikin/MinikinFont.h>
 #include <minikin/AnalyzeStyle.h>
 #include <minikin/FontFamily.h>
+#include <UniquePtr.h>
 
 using std::vector;