Remove unused type

Change-Id: I9d9d42d0bd4074d96e026a485436cc1d91a7ebb2
diff --git a/cmd/sb/sb2/shell.go b/cmd/sb/sb2/shell.go
index a4c6b37..c181534 100644
--- a/cmd/sb/sb2/shell.go
+++ b/cmd/sb/sb2/shell.go
@@ -26,14 +26,6 @@
 `,
 }
 
-type Command struct {
-	Short    string
-	Long     string
-	ArgsName string
-	ArgsLong string
-	Runner func(ctx *context.T, env *cmdline.Env, db syncbase.Database, args []string) error
-}
-
 // Runs the shell.
 // Takes commands as input, executes them, and spits out output.
 func runSbShell(ctx *context.T, env *cmdline.Env, args []string) error {