Reset the list of sequence switch key codes when switching key maps.

chrome/browser/resources/chromeos/chromevox/cvox2/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 The entry point for all ChromeVox2 related code for the
  * background page.
  */
 
 goog.provide('Background');
@@ skipping 563 matching lines @@
     });
   },
 
   /**
    * Sets the current ChromeVox mode.
    * @param {ChromeVoxMode} mode
    * @param {boolean=} opt_injectClassic Injects ChromeVox classic into tabs;
    *                                     defaults to false.
    */
   setChromeVoxMode: function(mode, opt_injectClassic) {
+    // Switching key maps potentially affects the key codes that involve
+    // sequencing. Without resetting this list, potentially stale key codes
+    // remain. The key codes themselves get pushed in
+    // cvox.KeySequence.deserialize which gets called by cvox.KeyMap.
+    cvox.ChromeVox.sequenceSwitchKeyCodes = [];
     if (mode === ChromeVoxMode.CLASSIC || mode === ChromeVoxMode.COMPAT)
       cvox.ChromeVoxKbHandler.handlerKeyMap = cvox.KeyMap.fromDefaults();
     else
       cvox.ChromeVoxKbHandler.handlerKeyMap = cvox.KeyMap.fromNext();
 
     if (mode == ChromeVoxMode.CLASSIC) {
       if (chrome.commands &&
           chrome.commands.onCommand.hasListener(this.onGotCommand))
         chrome.commands.onCommand.removeListener(this.onGotCommand);
     } else {
@@ skipping 88 matching lines @@
     return glob.replace(/[.+^$(){}|[\]\\]/g, '\\$&')
         .replace(/\*/g, '.*')
         .replace(/\?/g, '.');
   }).join('|') + ')$');
 };
 
 /** @type {Background} */
 global.backgroundObj = new Background();
 
 });  // goog.scope