Use new earcons in ChromeVox Next.

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

Index: chrome/browser/resources/chromeos/chromevox/chromevox/background/background.js
diff --git a/chrome/browser/resources/chromeos/chromevox/chromevox/background/background.js b/chrome/browser/resources/chromeos/chromevox/chromevox/background/background.js
index 1f07264886195797cdf01d585b2a7bcb5e69dbb9..f89849792ec0e8f613878c5ab8fb2f047eeac875 100644
--- a/chrome/browser/resources/chromeos/chromevox/chromevox/background/background.js
+++ b/chrome/browser/resources/chromeos/chromevox/chromevox/background/background.js
@@ -76,7 +76,6 @@ cvox.ChromeVoxBackground.prototype.init = function() {
       .add(this.backgroundTts_)
       .add(consoleTts);
 
-  this.earcons = new cvox.EarconsBackground();
   this.addBridgeListener();
 
   /**
@@ -86,13 +85,12 @@ cvox.ChromeVoxBackground.prototype.init = function() {
    */
   this.backgroundBraille_ = new cvox.BrailleBackground();
 
-    this.tabsApiHandler_ = new cvox.TabsApiHandler(
-      this.tts, this.backgroundBraille_, this.earcons);
+  this.tabsApiHandler_ = new cvox.TabsApiHandler();
 
   // Export globals on cvox.ChromeVox.
   cvox.ChromeVox.tts = this.tts;
   cvox.ChromeVox.braille = this.backgroundBraille_;
-  cvox.ChromeVox.earcons = this.earcons;
+  cvox.ChromeVox.earcons = new cvox.EarconsBackground();
 
   if (cvox.ChromeVox.isChromeOS &&
       chrome.accessibilityPrivate.onIntroduceChromeVox) {
@@ -265,7 +263,7 @@ cvox.ChromeVoxBackground.prototype.onTtsMessage = function(msg) {
  */
 cvox.ChromeVoxBackground.prototype.onEarconMessage = function(msg) {
   if (msg.action == 'play') {
-    this.earcons.playEarcon(msg.earcon);
+    cvox.ChromeVox.earcons.playEarcon(msg.earcon);
   }
 };
 
@@ -329,7 +327,7 @@ cvox.ChromeVoxBackground.prototype.addBridgeListener = function() {
                 false);
           }
         } else if (msg['pref'] == 'earcons') {
-          this.earcons.enabled = msg['value'];
+          cvox.ChromeVox.earcons.enabled = msg['value'];
         } else if (msg['pref'] == 'sticky' && msg['announce']) {
           if (msg['value']) {
             this.tts.speak(cvox.ChromeVox.msgs.getMsg('sticky_mode_enabled'),