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In some cases, like the FilesApp which is served from a
chrome-extension:// scheme, converting all chrome:// URLs to
scheme-relative URLs is not desired.

Adding a |preserve_url_scheme| to opt-out of the default behavior.

Bug: 1128313
Change-Id: I48fe8fda4320d8ff3eaca35229c8c34cd55407de
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2411563Reviewed-by: Rebekah Potter <rbpotter@chromium.org>
Commit-Queue: dpapad <dpapad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#807369}