connectivity: Get rid of unused Reporter interface. (#3875)

connectivity/connectivity.go

@@ -22,8 +22,6 @@
 package connectivity
 
 import (
-	"context"
-
 	"google.golang.org/grpc/grpclog"
 )
 
@@ -63,13 +61,3 @@ const (
 	// Shutdown indicates the ClientConn has started shutting down.
 	Shutdown
 )
-
-// Reporter reports the connectivity states.
-type Reporter interface {
-	// CurrentState returns the current state of the reporter.
-	CurrentState() State
-	// WaitForStateChange blocks until the reporter's state is different from the given state,
-	// and returns true.
-	// It returns false if <-ctx.Done() can proceed (ctx got timeout or got canceled).
-	WaitForStateChange(context.Context, State) bool
-}