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Sub-pages may have parameters (e.g. networkDetail?guid=vpn2_guid) so we
need to trim off the query before deciding if it's an OS sub-page.

Bug: 966579
Change-Id: I179ccec90edb4155cd09bc44d498ee62f2e077b7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1628132
Auto-Submit: James Cook <jamescook@chromium.org>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Commit-Queue: James Cook <jamescook@chromium.org>
Cr-Commit-Position: refs/heads/master@{#662870}