Remove an unused parameter in ThreadPoolWorker.

src/core/lib/iomgr/executor/threadpool.cc

@@ -59,7 +59,7 @@ void ThreadPool::SharedThreadPoolConstructor() {
       gpr_zalloc(num_threads_ * sizeof(ThreadPoolWorker*)));
   for (int i = 0; i < num_threads_; ++i) {
     threads_[i] =
-        New<ThreadPoolWorker>(thd_name_, this, queue_, thread_options_, i);
+        New<ThreadPoolWorker>(thd_name_, queue_, thread_options_, i);
     threads_[i]->Start();
   }
 }

src/core/lib/iomgr/executor/threadpool.h

@@ -62,9 +62,8 @@ class ThreadPoolInterface {
 // NULL closure.
 class ThreadPoolWorker {
  public:
-  ThreadPoolWorker(const char* thd_name, ThreadPoolInterface* pool,
+  ThreadPoolWorker(const char* thd_name, MPMCQueueInterface* queue,
-                   MPMCQueueInterface* queue, Thread::Options& options,
+                   Thread::Options& options, int index)
-                   int index)
       : queue_(queue), thd_name_(thd_name), index_(index) {
     thd_ = Thread(thd_name,
                   [](void* th) { static_cast<ThreadPoolWorker*>(th)->Run(); },