mozilla/pdf.js — pull request #4333 by dferer (2014-02-25 16:33:01+00:00)
Title: Made viewer's webViewerLoad callable from outside viewer.js

In case the viewer is loaded programmatically after "DOMContentLoaded" is triggered.
"PDFView.open" is also conditioned on "file" being set, allowing "DEFAULT_URL" to be null in "generic" mode.