Now we have a proper C++ library, use std::unique_ptr.

Also remove the Android.libcxx.mk and other bits of stlport compatibility
mechanics.

Change-Id: Icdf7188ba3c79cdf5617672c1cfd0a68ae596a61
diff --git a/compiler/driver/compiler_driver_test.cc b/compiler/driver/compiler_driver_test.cc
index fe3a4e6..4efd27d 100644
--- a/compiler/driver/compiler_driver_test.cc
+++ b/compiler/driver/compiler_driver_test.cc
@@ -18,8 +18,8 @@
 
 #include <stdint.h>
 #include <stdio.h>
+#include <memory>
 
-#include "UniquePtrCompat.h"
 #include "class_linker.h"
 #include "common_compiler_test.h"
 #include "dex_file.h"