Don't show ChromeVox release notes on a version change.

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 fb803d1f863b483abdebc2661a3b4614118e849c..177187b82ec8c81d9c82871f99281974d11131af 100644
--- a/chrome/browser/resources/chromeos/chromevox/chromevox/background/background.js
+++ b/chrome/browser/resources/chromeos/chromevox/chromevox/background/background.js
@@ -104,8 +104,6 @@ cvox.ChromeVoxBackground.prototype.init = function() {
         this.onLoadStateChanged);
   }
 
-  this.checkVersionNumber();
-
   // Set up a message passing system for goog.provide() calls from
   // within the content scripts.
   chrome.extension.onMessage.addListener(
@@ -423,67 +421,6 @@ cvox.ChromeVoxBackground.prototype.addBridgeListener = function() {
 
 
 /**
- * Checks the version number. If it has changed, display release notes
- * to the user.
- */
-cvox.ChromeVoxBackground.prototype.checkVersionNumber = function() {
-  // Don't update version or show release notes if the current tab is within an
-  // incognito window (which may occur on ChromeOS immediately after OOBE).
-  if (this.isIncognito_()) {
-    return;
-  }
-  this.localStorageVersion = localStorage['versionString'];
-  this.showNotesIfNewVersion();
-};
-
-
-/**
- * Display release notes to the user.
- */
-cvox.ChromeVoxBackground.prototype.displayReleaseNotes = function() {
-  chrome.tabs.create(
-      {'url': 'http://chromevox.com/release_notes.html'});
-};
-
-
-/**
- * Gets the current version number from the extension manifest.
- */
-cvox.ChromeVoxBackground.prototype.showNotesIfNewVersion = function() {
-  // Check version number in manifest.
-  var url = chrome.extension.getURL('manifest.json');
-  var xhr = new XMLHttpRequest();
-  var context = this;
-  xhr.onreadystatechange = function() {
-    if (xhr.readyState == 4) {
-      var manifest = JSON.parse(xhr.responseText);
-      console.log('Version: ' + manifest.version);
-
-      var shouldShowReleaseNotes =
-          (context.localStorageVersion != manifest.version);
-
-      // On Chrome OS, don't show the release notes the first time, only
-      // after a version upgrade.
-      if (navigator.userAgent.indexOf('CrOS') != -1 &&
-          context.localStorageVersion == undefined) {
-        shouldShowReleaseNotes = false;
-      }
-
-      if (shouldShowReleaseNotes) {
-        context.displayReleaseNotes();
-      }
-
-      // Update version number in local storage
-      localStorage['versionString'] = manifest.version;
-      this.localStorageVersion = manifest.version;
-    }
-  };
-  xhr.open('GET', url);
-  xhr.send();
-};
-
-
-/**
  * Read and apply preferences that affect the background context.
  */
 cvox.ChromeVoxBackground.prototype.readPrefs = function() {