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With most of routes shared between ChromeOS and browser renamed except
for Sync routes, a DCHECK can be used when opening browser settings
pages to that the |sub_page| is not an OS-specific setting.

Bug: 990169
Change-Id: I84ca6c5584d405d3a2deed2d61878c70d3744c54
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2138115
Commit-Queue: Nnamdi Theodore Johnson-kanu <tjohnsonkanu@google.com>
Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: James Cook <jamescook@chromium.org>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#758529}