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The URLLoaderFactory interface grabbed from g_process can become
invalidated, like on network changes, so we can't save it. This change
modifies PpdProvider to grab it fresh before every fetch.

Test: chromeos_unittests passes
Bug: chromium:1123567
Change-Id: I2718548c45b61b34d78c17966037e8ccb91d654f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2389020Reviewed-by: Piotr Pawliczek <pawliczek@chromium.org>
Reviewed-by: Sean Kau <skau@chromium.org>
Commit-Queue: Luum Habtemariam <luum@chromium.org>
Cr-Commit-Position: refs/heads/master@{#805835}