P1 bug: Missing import on"3.0.0-pre.6" app-route

[Kibeom Kim]

Description

On importing app-route.js on 3.0.0-pre.6, browser emits an error:

Expected outcome

No js error

Actual outcome

Js error

app-route.js:3 Uncaught ReferenceError: Polymer is not defined
    at app-route.js:3

It looks like import { Polymer } from '../polymer/lib/legacy/polymer-fn.js'; line was removed at some point and that caused the error

[Kibeom Kim]

@Deepayan-Ghosh

[Kibeom Kim]

it seems like the last known good version is 3.0.0-pre.1