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This CL renames the FileURLLoaderFactory in an anonymous namespace in
//chrome/browser/chrome_content_browser_client.cc to
SpecialAccessFileURLLoaderFactory (to distinguish it from the
content::FileURLLoaderFactory).

This CL introduces SpecialAccessFileURLLoaderFactory::Create static
method that allows creating a SpecialAccessFileURLLoaderFactory that is
owned by its |receivers_| and will self-delete when the last receiver
disconnects.

This CL removes the ability to directly construct and own a
std::unique_ptr<SpecialAccessFileURLLoaderFactory>, because this ability
means that the factory can be destructed while receivers bound via the
Clone method are still alive (see the associated bug).

This CL mostly just follows the pattern established earlier by
https://crrev.com/c/2337411.

Bug: 1106995
Change-Id: If5d9731ceee4d62144e12c18f67dda7df4379b0a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2358058Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Commit-Queue: Łukasz Anforowicz <lukasza@chromium.org>
Cr-Commit-Position: refs/heads/master@{#812071}