[jsfunfuzz] Update parameters to evaluate

[nth10sd]

I was reading through the following after reading that newContext in evaluate is now removed.

@jruderman, besides newContext, are saveFrameChain, elementProperty and sourcePolicy still used?

[jruderman]

• newContext: removed in https://hg.mozilla.org/mozilla-central/rev/1258a697a4bb
• saveFrameChain: removed in https://hg.mozilla.org/mozilla-central/rev/d835e1ad4222
• elementProperty: renamed to elementAttributeName in https://hg.mozilla.org/mozilla-central/rev/8bcd545cf484
• sourcePolicy: replaced with the boolean sourceIsLazy, in https://hg.mozilla.org/mozilla-central/rev/95391b25bc11