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... down into blink/renderer.

CL also moves the following pure virtual classes: network_list_manager.h
and network_list_observer.h to the same location, and adds a TODO to
verify their existence altogether.

BUG=787254, 919392
R=guidou@chromium.org, haraken@chromium.org

Change-Id: Iabba2936c745d028f5388153d5fe0d10ec19a8b0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1806977
Commit-Queue: Antonio Gomes <tonikitoo@igalia.com>
Reviewed-by: Guido Urdaneta <guidou@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Cr-Commit-Position: refs/heads/master@{#697641}