Remove channel_id_path from NetworkContextParams (and other related places)

Bug: 875053
Change-Id: If4f1d54d435710a351451f7296057d789acfd449
Reviewed-on: https://chromium-review.googlesource.com/c/1435678
Reviewed-by: Richard Coles <torne@chromium.org>
Reviewed-by: Dominick Ng <dominickn@chromium.org>
Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
Reviewed-by: Pavel Feldman <pfeldman@chromium.org>
Commit-Queue: Nick Harper <nharper@chromium.org>
Cr-Commit-Position: refs/heads/master@{#628958}
9 files changed