Match Safari in anonymizing js method values

[iccub]

More details https://bravesoftware.slack.com/archives/C023VS4HJ6Q/p1655233690880109?thread_ts=1655232077.572789&cid=C023VS4HJ6Q

[thypon]

I think we should implement a generic utils method to lift this issue. Hereafter an example implementation:

const generatePPToString = (body) => {
    const toString = () => {
      return body
    }

    const recursiveToString = () => {
      return Object.toString.toString()
    }

    recursiveToString.toString = recursiveToString
    toString.toString = recursiveToString

    return toString
  }

[thypon]

Cc @cuba regarding https://github.com/brave/brave-ios/pull/5444

[Brandon-T]

This was done as part of the Javascript refactor and also in SolanaWeb3.js