Bindings change? Seems like a fix to me.

for (var item in localStorage) console.log(item);

Chrome 62 logs: undefined
Chrome 63 logs: length, key, getItem, setItem, removeItem, clear
Safari 11 logs: length, key, getItem, setItem, removeItem, clear
Firefox 57 logs: key, getItem, setItem, removeItem, clear, length
Edge 16 logs: undefined

Marking as WontFix / working as intended since this seems to have improved interop.

> Bindings change? Seems like a fix to me.

This is likely a consequence of https://chromium-review.googlesource.com/691974, documented in https://www.chromestatus.com/feature/5120599789666304

But this is not backwards compatible since a lot might have a for(var item in localStorage) loop to get all the stored items but this wont work with the new version. Especially if it is a mobile application built with Cordova and users update chrome application. 

#3 - correct, this is not backward compatible, but your Cordova application would have been broken on recent iOS as well (or using a Firefox webview, if such option exists), because the new behavior interoperates with the most of the browsers (Edge behaves like old Chrome).