Fix unexpected metrics preference resetting.

chrome/browser/resources/chromeos/arc_support/background.js

 // Copyright 2016 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.
 
 /**
  * UI Pages. Note the order must be in sync with the ArcAuthService::UIPage
  * enum.
  * @type {Array<string>}
  */
 var UI_PAGES = ['none',
@@ skipping 557 matching lines @@
       chrome.browser.openTab({'url': event.targetUrl}, function() {});
     });
 
     var onAgree = function() {
       termsAccepted = true;
 
       var enableMetrics = doc.getElementById('enable-metrics');
       var enableBackupRestore = doc.getElementById('enable-backup-restore');
       var enableLocationService = doc.getElementById('enable-location-service');
       sendNativeMessage('onAgreed', {
-        isMetricsEnabled: !enableMetrics.hidden && enableMetrics.checked,
+        isMetricsEnabled: enableMetrics.checked,
         isBackupRestoreEnabled: enableBackupRestore.checked,
         isLocationServiceEnabled: enableLocationService.checked
       });
     };
 
     var onCancel = function() {
       if (appWindow) {
         appWindow.close();
       }
     };
@@ skipping 57 matching lines @@
       type: 'chrome',
       color: '#ffffff'
     },
     'innerBounds': {
       'width': INNER_WIDTH,
       'height': INNER_HEIGHT
     }
   };
   chrome.app.window.create('main.html', options, onWindowCreated);
 });