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This CL fixes the code coverage documentation:
1. 'is_debug=false' gn arg is required.
2. Sandbox is working now.
3. Remove obsolete links.

Bug: 1012473
Change-Id: I178f42cd6879fbfaf464d344ee272268ee654ea3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1874486
Commit-Queue: Yuke Liao <liaoyuke@chromium.org>
Reviewed-by: Nodir Turakulov <nodir@chromium.org>
Cr-Commit-Position: refs/heads/master@{#708351}