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The old HostChangeNotificationListener listens to host deletion events
from XMPP, which will go away with the gTalk turn down. New hosts rely
on FtlHostChangeNotificationListener for getting host deletion events
through FTL. This CL deletes the old HostChangeNotificationListener.

Bug: 983282
Change-Id: I0d9acb261d3702391f8345a228853d9c4e1af5c0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1700472
Commit-Queue: Yuwei Huang <yuweih@chromium.org>
Commit-Queue: Joe Downing <joedow@chromium.org>
Reviewed-by: Joe Downing <joedow@chromium.org>
Cr-Commit-Position: refs/heads/master@{#677081}