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This CL changes the name of the 'Downloads' Settings section to 'Files'
in CrOS settings and reflects the change in the code by renaming the
corresponding files in
chrome/browser/resources/settings/chromeos/os_downloads_page/ to follow
the use the name 'file' rather than 'download'. It also factors out the
string provision into a CrOS specific AddFilesStrings function in
chrome/browser/ui/webui/settings/settings_localized_strings_provider.cc.

New text screenshot: http://screen/HzEdJpRp80Q

Bug: 978648
Change-Id: I71ea9102190ef0c45e2b578f721147e94b3a6e54
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1696180
Commit-Queue: Jordy Greenblatt <jordynass@chromium.org>
Reviewed-by: May Lippert <maybelle@chromium.org>
Reviewed-by: Hector Carmona <hcarmona@chromium.org>
Cr-Commit-Position: refs/heads/master@{#676595}