Always send the wake-on-wifi setting when the network device list is updated

Always send the wake-on-wifi setting when the network device list is updated

If shill happens to restart or re-create the wifi device then the wake
on wifi setting will not persist.  To deal with this, always send the
current wake on wifi setting when the network device list is updated
unless the setting hasn't been initialized.

BUG=475199
Review URL: https://codereview.chromium.org/1104183005

Cr-Commit-Position: refs/heads/master@{#327432}
(cherry picked from commit 62c854e6aaa291a9e3861b8c6d83bbb76b8392f5)

TBR=michaelpg,stevenjb

Committed: https://chromium.googlesource.com/chromium/src/+/a9d29d8cc01ca28d6c2139296ba446480dc84bfb

[Chirantan Ekbote, 2015-05-01 19:16:50]

chirantan@chromium.org changed reviewers:
+ michaelpg@chromium.org, stevenjb@chromium.org

[Chirantan Ekbote, 2015-05-01 19:16:51]

Landing on R43 branch

[Chirantan Ekbote, 2015-05-01 19:18:59]

Committed patchset #1 (id:1) manually as
a9d29d8cc01ca28d6c2139296ba446480dc84bfb (presubmit successful).