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The hardcoded list of CT logs is only safe for clients that support
regular updates and the capability of rapid updates, such as Google
Chrome. Hardcoding a list log logs in products that are not regularly
updated runs the risk of ossifying or fragmenting the CT ecosystem.

To avoid accidental misuse, move from //net into
//components/certificate_transparency, moving it further away from
the notion as a "base service" and more into "an optional component
with caveats".

BUG=702062

Cq-Include-Trybots: master.tryserver.chromium.linux:linux_mojo;master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: I6be05436a916779bd5c8fcf7fe93b120bda47828
Reviewed-on: https://chromium-review.googlesource.com/1052073
Commit-Queue: Ryan Sleevi <rsleevi@chromium.org>
Reviewed-by: Eran Messeri <eranm@chromium.org>
Reviewed-by: Ryan Hamilton <rch@chromium.org>
Reviewed-by: Jochen Eisinger <jochen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#557993}