zone.js breaks IndexedDB on Safari via EventTarget monkey patch

[jpike88]

I've been looking at migrating from ng1 over the last week and after much pain I've realised that pouchdb-browser was breaking due to a modification that affects IndexedDB on Safari and Mobile Safari (WKWebView).

Issue reproduced here:

https://stackblitz.com/edit/angular-issue-repro2-bo2cgs

Issue only occurs on Safari/Mobile Safari.

Uncaught NotFoundError: Failed to execute 'transaction' on 'IDBDatabase': One of the specified object stores was not found.

As someone who was finally looking at migrating to ng2, this is a major disappointment, I waited a long time before migrating as I thought it would have matured by now. But breaking IndexedDB on a popular browser is a dealbreaker for continuing with the migration.

EDIT: this old PR looks like it might be related? Don't know
#204