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'file:' is special, because it produces a non opaque origin, uses
port= = 0, and the conversion from/blink blink preserves port == 0.

Previous patch:
https://chromium.googlesource.com/chromium/src/+/a444094dd1d17b48a5a93629ac864a5c43671287
provided a different expectations for origins with (port == 0).

When this happens, blink replace zero by
DefaultPortForPrototocol(scheme):
- http  => 80
- https => 443
- ws    => 80
- wss   => 443
- ftp   => 21
- ftps  => 990
- _     => 0

So when the scheme is "file", zero is replaced by zero and the
transformation can be reversed.

Fixed: 1143052
Bug: 1144091
Change-Id: I8368cba6fa341a67b579ccfd9c972aace9e1e2b5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2510052
Commit-Queue: Arthur Sonzogni <arthursonzogni@chromium.org>
Reviewed-by: Mike West <mkwst@chromium.org>
Cr-Commit-Position: refs/heads/master@{#825279}