Settings/Oobe: Simplify cr-network-select and use flex

chrome/browser/resources/chromeos/login/oobe_welcome.js

Index: chrome/browser/resources/chromeos/login/oobe_welcome.js
diff --git a/chrome/browser/resources/chromeos/login/oobe_welcome.js b/chrome/browser/resources/chromeos/login/oobe_welcome.js
index 6fb51628056a970923924c724a9cebd46016125d..6384059d2a343e434016b14465755a02ebc6137a 100644
--- a/chrome/browser/resources/chromeos/login/oobe_welcome.js
+++ b/chrome/browser/resources/chromeos/login/oobe_welcome.js
@@ -72,6 +72,7 @@ Polymer({
     networkSelectionScreenShown: {
       type: Boolean,
       value: false,
+      observer: 'networkSelectionScreenShownChanged_',
     },
 
     /**
@@ -133,6 +134,18 @@ Polymer({
     this.$.welcomeNextButton.focus();
   },
 
+  /** @private */
+  networkSelectionScreenShownChanged_: function() {
+    if (this.networkSelectionScreenShown) {
+      // After #networkSelect is stamped, trigger a refresh so that the list
+      // will be updated with the currently visible networks and sized
+      // appropriately.
+      this.async(function() {
+        this.$.networkSelect.refreshNetworks();
+      }.bind(this));
+    }
+  },
+
   /**
    * Handles "visible" event.
    * @private