GitLab

Added function that allows javascript apps using gcdPrivate to get a list of networks with prefetched passwords.

Fixed reland of https://codereview.chromium.org/434733003/ which was reverted due to test failure.

BUG=383167
TBR=asargent@chromium.org,vitalybuka@chromium.org

Review URL: https://codereview.chromium.org/450533003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@287995 0039d316-1c4b-4281-b951-d872f2087c98