Remove unused function OSSettingsUI::RegisterProfilePrefs

The prefs are all browser-settings-specific and are registered in
SettingsUI::RegisterProfilePrefs().

Bug: none
Test: compiles
Change-Id: I6fc2610b834a66f5ae502963aac19c93e19de61b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1574962
Auto-Submit: James Cook <jamescook@chromium.org>
Commit-Queue: Demetrios Papadopoulos <dpapad@chromium.org>
Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#652624}
2 files changed