Remove redundant ExecCtx
diff --git a/src/core/lib/surface/completion_queue.cc b/src/core/lib/surface/completion_queue.cc
index d036391..f751741 100644
--- a/src/core/lib/surface/completion_queue.cc
+++ b/src/core/lib/surface/completion_queue.cc
@@ -390,7 +390,6 @@
 
 static grpc_cq_completion* cq_event_queue_pop(grpc_cq_event_queue* q) {
   grpc_cq_completion* c = nullptr;
-  grpc_core::ExecCtx exec_ctx;
 
   if (gpr_spinlock_trylock(&q->queue_lock)) {
     GRPC_STATS_INC_CQ_EV_QUEUE_TRYLOCK_SUCCESSES();