fix(v2 mobile): dropStorage throw error

[blackbing]

Summary:

clearStorage will throw error. I have commented on this thread.
#113 (comment)

Test Plan:

import storage from './storage.ts';

await storage.clearStorage();   //--> it will cause error before.

[krizzu]

Hey @blackbing ,
Thanks for your input, but I actually fixed this in #314

I'll go ahead and close this one down.