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Relax redirect safety checks, which exist in the network
service but were not present in URLRequestJob, to allow
the loading of a file/filesystem scheme to redirect to
the file/filesystem scheme.

One example of a redirect is where the following URL:

  file:///path/to/directory

during reload is redirected to:

  file:///path/to/directory/

This change also fixes redirects of Windows file links
(with network service) as it redirects back to the client
before following the redirect. This avoids an infinite
recursion bug triggered by circular symbolic links.

Bug: 884277,887039
Change-Id: I13923fc29397b1d3aa6679d861e9edc3af1c816b
Reviewed-on: https://chromium-review.googlesource.com/1234335Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Commit-Queue: Chris Mumford <cmumford@chromium.org>
Cr-Commit-Position: refs/heads/master@{#594450}