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The ProxyCrosSettingsProvider was not a real SignedSettings handler since the
network manager was introduced and was only used to parse the data for the UI.
However this does not go well with the unification of the SignedSettings
handling and belongs to the presentation layer. Therefore we extract the
parsing functionality in a helper class and move some of the logic up the
UI handling layer.

BUG=chromium-os:14054
TEST=Proxy UI should still be working (automation tests).

Review URL: http://codereview.chromium.org/8467012

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@109886 0039d316-1c4b-4281-b951-d872f2087c98