Switch UniquePtr to std::unique_ptr.

Bug: 21209050
Change-Id: I91d4c44de479b37f2729382fcdf103b8c69aa668
diff --git a/debuggerd/backtrace.cpp b/debuggerd/backtrace.cpp
index 79ee4e5..b8084c5 100644
--- a/debuggerd/backtrace.cpp
+++ b/debuggerd/backtrace.cpp
@@ -28,10 +28,11 @@
 #include <sys/types.h>
 #include <sys/ptrace.h>
 
+#include <memory>
+
 #include <backtrace/Backtrace.h>
 
 #include <log/log.h>
-#include <UniquePtr.h>
 
 #include "backtrace.h"
 
@@ -96,7 +97,7 @@
     return;
   }
 
-  UniquePtr<Backtrace> backtrace(Backtrace::Create(tid, BACKTRACE_CURRENT_THREAD));
+  std::unique_ptr<Backtrace> backtrace(Backtrace::Create(tid, BACKTRACE_CURRENT_THREAD));
   if (backtrace->Unwind(0)) {
     dump_backtrace_to_log(backtrace.get(), log, "  ");
   } else {