WebUI: Enable ESLint rule for missing semicolons.

chrome/browser/resources/chromeos/power.js

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 /**
  * Plot a line graph of data versus time on a HTML canvas element.
  *
  * @param {HTMLCanvasElement} plotCanvas The canvas on which the line graph is
  *     drawn.
  * @param {HTMLCanvasElement} legendCanvas The canvas on which the legend for
@@ skipping 818 matching lines @@
 function showHideCallback(sectionId, buttonId, requestFunction) {
   return function() {
     if ($(sectionId).hidden) {
       $(sectionId).hidden = false;
       $(buttonId).textContent = loadTimeData.getString('hideButton');
       requestFunction();
     } else {
       $(sectionId).hidden = true;
       $(buttonId).textContent = loadTimeData.getString('showButton');
     }
-  }
+  };
 }
 
 var powerUI = {
   showBatteryChargeData: showBatteryChargeData,
   showCpuIdleData: showCpuIdleData,
   showCpuFreqData: showCpuFreqData
 };
 
 document.addEventListener('DOMContentLoaded', function() {
   $('battery-charge-section').hidden = true;
   $('battery-charge-show-button').onclick = showHideCallback(
       'battery-charge-section',
       'battery-charge-show-button',
       requestBatteryChargeData);
   $('battery-charge-reload-button').onclick = requestBatteryChargeData;
   $('sample-count-input').onclick = requestBatteryChargeData;
 
   $('cpu-idle-section').hidden = true;
   $('cpu-idle-show-button').onclick = showHideCallback(
       'cpu-idle-section', 'cpu-idle-show-button', requestCpuIdleData);
   $('cpu-idle-reload-button').onclick = requestCpuIdleData;
 
   $('cpu-freq-section').hidden = true;
   $('cpu-freq-show-button').onclick = showHideCallback(
       'cpu-freq-section', 'cpu-freq-show-button', requestCpuFreqData);
   $('cpu-freq-reload-button').onclick = requestCpuFreqData;
 });