WebUI: swap paper-dropdown-menu out for md-select.

chrome/browser/resources/chromeos/emulator/battery_settings.js

Index: chrome/browser/resources/chromeos/emulator/battery_settings.js
diff --git a/chrome/browser/resources/chromeos/emulator/battery_settings.js b/chrome/browser/resources/chromeos/emulator/battery_settings.js
index 8487802f592b45ad73d3c74071d80931099222df..cb3a2ef918c38d9991ba4c470feb2f1409062ac4 100644
--- a/chrome/browser/resources/chromeos/emulator/battery_settings.js
+++ b/chrome/browser/resources/chromeos/emulator/battery_settings.js
@@ -28,8 +28,9 @@ var BatterySettings = Polymer({
      */
     batteryStateOptions: {
       type: Array,
-      value: function() { return ['Full', 'Charging', 'Discharging',
-                                  'Not Present']; },
+      value: function() {
+        return ['Full', 'Charging', 'Discharging', 'Not Present'];
+      },
     },
 
     /**
@@ -119,6 +120,10 @@ var BatterySettings = Polymer({
       chrome.send('updateTimeToFull', [this.timeUntilFull]);
   },
 
+  onPowerChanged: function(e) {
+    e.model.set('item.power', e.target.value);
+  },
+
   updatePowerProperties: function(power_properties) {
     this.batteryPercent = power_properties.battery_percent;
     this.batteryState =