Call correct callback in preferred_networks.js

BUG=chromium-os:27181
TEST=Forget a network on a chromeos device; confirm that network is forgotten after reloading UI and after restart.
TBR=jhawkins for options2 owner

Review URL: https://chromiumcodereview.appspot.com/10392185

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@138288 0039d316-1c4b-4281-b951-d872f2087c98

chrome/browser/resources/options2/chromeos/preferred_networks.js

@@ -124,7 +124,7 @@ cr.define('options', function() {
       var item = this.dataModel.item(index);
       if (item) {
         // Inform the network library that we are forgetting this network.
-        chrome.send('buttonClickCallback',
+        chrome.send('networkCommand',
                     [String(item.networkType),
                     item.servicePath,
                     'forget']);