Rob Wu 1c8cacd6b9 Limit PDFFetchStream to http(s) in the Chrome extension
The `fetch` API is only supported for http(s), even in Chrome extensions.
Because of this limitation, we should use the XMLHttpRequest API when the
requested URL is not a http(s) URL.

Fixes #9361
2018-01-14 00:34:46 +01:00
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