[fuzzer] Remove unused variable

`TempAutoDictionary` is never used.  Maybe a leftover of a previous
experiment?

Differential Revision: https://reviews.llvm.org/D88763

GitOrigin-RevId: c56bb45e839940fffabcbf928a3778cfffc31ddd
diff --git a/FuzzerMutate.h b/FuzzerMutate.h
index 37fd610..8cb9f86 100644
--- a/FuzzerMutate.h
+++ b/FuzzerMutate.h
@@ -129,9 +129,6 @@
 
   // Dictionary provided by the user via -dict=DICT_FILE.
   Dictionary ManualDictionary;
-  // Temporary dictionary modified by the fuzzer itself,
-  // recreated periodically.
-  Dictionary TempAutoDictionary;
   // Persistent dictionary modified by the fuzzer, consists of
   // entries that led to successful discoveries in the past mutations.
   Dictionary PersistentAutoDictionary;