TBR: discharge cache: Remove stale todo.

Change-Id: I0b7088d477a43ac13c3de4ec76cf112c760762b2
diff --git a/profiles/internal/rpc/discharges.go b/profiles/internal/rpc/discharges.go
index b9f8ff6..9a10533 100644
--- a/profiles/internal/rpc/discharges.go
+++ b/profiles/internal/rpc/discharges.go
@@ -176,7 +176,6 @@
 }
 
 // dischargeCache is a concurrency-safe cache for third party caveat discharges.
-// TODO(suharshs,ataly,ashankar): This should be keyed by filtered impetus as well.
 type dischargeCache struct {
 	mu       sync.RWMutex
 	cache    map[dischargeCacheKey]security.Discharge // GUARDED_BY(mu)