remove dead code in commitLimitter

diff --git a/src/hotspot/share/memory/metaspace/commitLimiter.hpp b/src/hotspot/share/memory/metaspace/commitLimiter.hpp
index f9b6598127c..be54677237c 100644
--- a/src/hotspot/share/memory/metaspace/commitLimiter.hpp
+++ b/src/hotspot/share/memory/metaspace/commitLimiter.hpp
@@ -72,7 +72,6 @@ public:
   void decrease_committed(size_t word_size) { _cnt.decrement_by(word_size); }

   size_t committed_words() const { return _cnt.get(); }
- size_t cap() const { return _cap; }

   // Returns the global metaspace commit counter
   static CommitLimiter* globalLimiter();