Do not allow network status updates while password field is active.
BUG=chromium-os:8304
TEST=manually show password field (click on password protected wireless network or "join other network...") and make some network change (disconnect ethernet cable etc.), and check if the status is unchanged, then close the password field by any possible means and check if status update is working.
Review URL: http://codereview.chromium.org/
4705003
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@65617 0039d316-1c4b-4281-b951-d872f2087c98