Revert of Added function to get list of networks with prefetched passwords.

Revert of Added function to get list of networks with prefetched passwords. (https://codereview.chromium.org/434733003/)

Reason for revert:
breaks win7 browser tests. GcdPrivateAPITest.WifiPasswords

http://build.chromium.org/p/chromium.win/builders/Win7%20Tests%20%28dbg%29%283%29/builds/27682/steps/browser_tests/logs/WifiPasswords

Original issue's description:
> Added function to get list of networks with prefetched passwords.
> 
> Added function that allows javascript apps using gcdPrivate to get a list of networks with prefetched passwords.
> 
> Rebase of https://codereview.chromium.org/427123002
> 
> BUG=383167
> TBR=asargent@chromium.org,noamsml@chromium.org
> 
> Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=287049

TBR=asargent@chromium.org,noamsml@chromium.org,vitalybuka@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=383167
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=287091

[erikchen, 2014-08-01 21:28:41]

Created Revert of Added function to get list of networks with prefetched
passwords.

[commit-bot: I haz the power, 2014-08-01 21:31:03]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/erikchen@chromium.org/433703003/1

[commit-bot: I haz the power, 2014-08-01 21:33:52]

Change committed as 287091