Reland fix ChromeVox Next compile.

chrome/browser/resources/chromeos/chromevox/chromevox/background/background.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.
 
 /**
  * @fileoverview Script that runs on the background page.
- *
  */
 
 goog.provide('cvox.ChromeVoxBackground');
 
 goog.require('cvox.AbstractEarcons');
 goog.require('cvox.AccessibilityApiHandler');
 goog.require('cvox.BrailleBackground');
 goog.require('cvox.BrailleCaptionsBackground');
 goog.require('cvox.ChromeVox');
 goog.require('cvox.ChromeVoxEditableTextBase');
@@ skipping 526 matching lines @@
   var background = new cvox.ChromeVoxBackground();
   background.init();
   window['speak'] = goog.bind(background.tts.speak, background.tts);
 
   // Export the prefs object for access by the options page.
   window['prefs'] = background.prefs;
 
   // Export the braille object for access by the options page.
   window['braille'] = cvox.ChromeVox.braille;
 
-  // Export this background page for ChromeVox Next to access.
-  cvox.ChromeVox.background = background;
+  // Export injection for ChromeVox Next.
+  cvox.ChromeVox.injectChromeVoxIntoTabs =
+      background.injectChromeVoxIntoTabs.bind(background);
 })();