Revert "GODT-2014: bridge quit if gRPC client ends stream."

This reverts commit 8ca849b7a8.

internal/frontend/grpc/service.go

@@ -59,13 +59,12 @@ const (
 // Service is the RPC service struct.
 type Service struct { // nolint:structcheck
 	UnimplementedBridgeServer
-	grpcServer         *grpc.Server //  the gGRPC server
-	listener           net.Listener
-	eventStreamCh      chan *StreamEvent
-	eventStreamChMutex sync.RWMutex
-	eventStreamDoneCh  chan struct{}
-	eventQueue         []*StreamEvent
-	eventQueueMutex    sync.Mutex
+	grpcServer        *grpc.Server //  the gGRPC server
+	listener          net.Listener
+	eventStreamCh     chan *StreamEvent
+	eventStreamDoneCh chan struct{}
+	eventQueue        []*StreamEvent
+	eventQueueMutex   sync.Mutex
 
 	panicHandler       types.PanicHandler
 	eventListener      listener.Listener