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This change introduces the //rlz:rlz_lib_no_network source_set for use
by Chrome's installer on Windows. This breaks a dependency on a slew of
networking pieces that bloat setup.exe. Results from building
chrome/installer/setup at r718552:

- before: 6536 build targets -- 2,590,720 bytes
- after : 2390 build targets -- 2,298,880 bytes

-   4,146 fewer build targets (63.43% reduction)
- 291,840 bytes smaller (11.26% reduction)

BUG=1026780

Change-Id: I99892e6b0b9f730e1467a9af1af55c42ddeb8903
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1932803Reviewed-by: Roger Tawa <rogerta@chromium.org>
Commit-Queue: Greg Thompson <grt@chromium.org>
Cr-Commit-Position: refs/heads/master@{#719145}