Eliminate Chromevox log spam.

chrome/browser/resources/chromeos/chromevox/cvox2/background/desktop_automation_handler.js

 // Copyright 2015 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.
 
 /**
  * @fileoverview Handles automation from a desktop automation node.
  */
 
 goog.provide('DesktopAutomationHandler');
 
@@ skipping 57 matching lines @@
     // Check to see if we've crossed roots. Continue if we've crossed roots or
     // are not within web content.
     if (node.root.role == 'desktop' ||
         !prevRange ||
         prevRange.start.node.root != node.root)
       global.backgroundObj.refreshMode(node.root.docUrl || '');
 
     // Don't process nodes inside of web content if ChromeVox Next is inactive.
     if (node.root.role != RoleType.desktop &&
         global.backgroundObj.mode === ChromeVoxMode.CLASSIC) {
-      chrome.accessibilityPrivate.setFocusRing([]);
+      if (cvox.ChromeVox.isChromeOS)
+        chrome.accessibilityPrivate.setFocusRing([]);
       return;
     }
 
     // Don't output if focused node hasn't changed.
     if (prevRange &&
         evt.type == 'focus' &&
         global.backgroundObj.currentRange.equals(prevRange))
       return;
 
     new Output().withSpeechAndBraille(
@@ skipping 194 matching lines @@
   if (cvox.ChromeVox.isMac)
     return;
   chrome.automation.getDesktop(function(desktop) {
     global.desktopAutomationHandler = new DesktopAutomationHandler(desktop);
   });
 };
 
 DesktopAutomationHandler.init_();
 
 });  // goog.scope