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This handler was little bit overcomplicated. This led to a bug in web
kiosk mode when we update network state, but do not update the handler.

Because of this convolution, in web kiosks, the network configure
screen did not update itself when connected to network(which is what
client will expect from the handler which observes network state).
Now it behaves more logically and predictably.

Bug: 1015383
Change-Id: I78b024b1d51b54b0d01d0a5a5694f6ae3f5ac19e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2031406
Commit-Queue: Anatoliy Potapchuk <apotapchuk@chromium.org>
Reviewed-by: Roman Sorokin [CET] <rsorokin@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#739128}