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Build this by setting optimize_webui = false (default is true)

What's in this change:
    - Move os_settings.html to c/b/r/settings/chromeos
    - Add new os_settings_resources.grd

What's still WIP:
    - Optimized webui build

BUG=950007

Change-Id: I752153668877a25a29b315cb82456ed564fd52df
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1553820Reviewed-by: Lei Zhang <thestig@chromium.org>
Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Commit-Queue: May Lippert <maybelle@chromium.org>
Auto-Submit: May Lippert <maybelle@chromium.org>
Cr-Commit-Position: refs/heads/master@{#649259}