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/runtime/exception_test.cc b/runtime/exception_test.cc
index 37ad9e5..751cdb6 100644
--- a/runtime/exception_test.cc
+++ b/runtime/exception_test.cc
@@ -14,6 +14,8 @@
  * limitations under the License.
  */
 
+#include <memory>
+
 #include "class_linker.h"
 #include "common_runtime_test.h"
 #include "dex_file.h"
@@ -27,7 +29,6 @@
 #include "scoped_thread_state_change.h"
 #include "handle_scope-inl.h"
 #include "thread.h"
-#include "UniquePtrCompat.h"
 #include "vmap_table.h"
 
 namespace art {