Global cleanup change.

--
MOS_MIGRATED_REVID=138816624
diff --git a/src/main/cpp/blaze_util_posix.cc b/src/main/cpp/blaze_util_posix.cc
index e678761..282c41c 100644
--- a/src/main/cpp/blaze_util_posix.cc
+++ b/src/main/cpp/blaze_util_posix.cc
@@ -30,7 +30,6 @@
 
 namespace blaze {
 
-using blaze_util::die;
 using blaze_util::pdie;
 
 using std::string;