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/elf_writer.cc b/compiler/elf_writer.cc
index ccc26a1..4c093c7 100644
--- a/compiler/elf_writer.cc
+++ b/compiler/elf_writer.cc
@@ -42,7 +42,7 @@
                                      size_t& oat_loaded_size,
                                      size_t& oat_data_offset) {
   std::string error_msg;
-  UniquePtr<ElfFile> elf_file(ElfFile::Open(file, false, false, &error_msg));
+  std::unique_ptr<ElfFile> elf_file(ElfFile::Open(file, false, false, &error_msg));
   CHECK(elf_file.get() != NULL) << error_msg;
 
   oat_loaded_size = elf_file->GetLoadedSize();