Remove obsolete JobQueue thread tracking

src/ripple/core/JobQueue.h

@@ -92,10 +92,6 @@ public:
     // Cannot be const because LoadMonitor has no const methods.
     bool isOverloaded ();
 
-    /** Get the Job corresponding to a thread.  If no thread, use the current
-        thread. */
-    Job* getJobForThread(std::thread::id const& id = {}) const;
-
     // Cannot be const because LoadMonitor has no const methods.
     Json::Value getJson (int c = 0);
 
@@ -109,8 +105,6 @@ private:
     JobDataMap m_jobData;
     JobTypeData m_invalidJobData;
 
-    std::map <std::thread::id, Job*> m_threadIds;
-
     // The number of jobs currently in processTask()
     int m_processCount;