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NetworkIconPurger was added before ActiveNetworkIcon was introduced.
It now makes sense to move the very limited functionality to
ActiveNetworkIcon which already implements the required observer and
interface.

Bug: 862420
Change-Id: I6aa1a28ae18050563786f592beb082f32117ddb2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1611873
Commit-Queue: Steven Bennetts <stevenjb@chromium.org>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#661383}