Remove unneeded window reference

[david-mark]

The document object is global.

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[david-mark]

I signed the CLA.

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[david-mark]

Also, the global document identifier needs to be added to here to appease ESLint:
https://github.com/angular/angular.js/blob/07849779ba365f371a8caa3b58e23f677cfdc5ad/.eslintrc-browser.json

For some reason I don't see that file in my fork (at least not on GitHub). (?)

[gkalpak]

The document object is global.

Depends on the environment 😃

This was deliberately added in #14345, in order to prevent a certain type of issues or make some usecases easier (see #14345 for more info).

[david-mark]

Couldn't imagine using AngularJS in Node (e.g. with jsdom), but apparently some can. :)