commit c083e644c805754ae5f4d1cbef72f6d438d71c22
author Peter Qiu <zqiu@google.com> Wed Jan 20 13:42:06 2016 -0800
committer Ningyuan Wang <nywang@google.com> Tue Jun 28 10:40:32 2016 -0700
tree 957b19eb3c0ac4facc51a92e2e79430b0d9779b6
parent c3385bb331965d4adacae39338bfe9bd6046e740

Cherry-pick: Remove WifiWatchdogStateMachine

Wifi watchdog is not being used anymore, the associated setting
("Settings -> Wi-Fi -> Advanced -> Avoid poor internet connection")
had already been deleted from UI.  So remove it.

While there, remove the unused state VerifyingLinkState in WifiStateMachine,
which is only triggered by WifiWatchdogStateMachine.

BUG=29533054
BUG=26254553

TEST=compile

Change-Id: I77dd1bc2b90cc0f3f94619e7b7df8293b068fcce