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This CL corrects settings_private.idl and prefs_util.cc so that
it is consistent with the javascript implementation.

Bug: 945082
Change-Id: I29777701297057d9cf262fb235ccb4291e4d699e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1724814Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Commit-Queue: Yilkal Abe <yilkal@chromium.org>
Cr-Commit-Position: refs/heads/master@{#681910}