Bug 1429904 - Remove unused operator< from StackKey and FrameKey. r=njn

nsGenericHashKey never calls this operator, as far as I can tell.

MozReview-Commit-ID: NDybMI8DOA

--HG--
extra : rebase_source : 933c12e2ef4600ea33b6c7026f539e51447fc454

tools/profiler/core/ProfileBufferEntry.h

@@ -203,9 +203,6 @@ public:
 
     uint32_t Hash() const;
     bool operator==(const FrameKey& aOther) const;
-    bool operator<(const FrameKey& aOther) const {
-      return mHash < aOther.mHash;
-    }
 
   private:
     uint32_t mHash;
@@ -233,10 +230,6 @@ public:
       return mPrefixStackIndex == aOther.mPrefixStackIndex &&
              mFrameIndex == aOther.mFrameIndex;
     }
-    bool operator<(const StackKey& aOther) const
-    {
-      return mHash < aOther.mHash;
-    }
 
   private:
     uint32_t mHash;