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

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

Index: chrome/browser/resources/chromeos/chromevox/cvox2/background/background.js
diff --git a/chrome/browser/resources/chromeos/chromevox/cvox2/background/background.js b/chrome/browser/resources/chromeos/chromevox/cvox2/background/background.js
index 4c04953b4c4de4423ef5c1fad28d83138dc4043f..8733b090b955fda447d205b7be08418463c699aa 100644
--- a/chrome/browser/resources/chromeos/chromevox/cvox2/background/background.js
+++ b/chrome/browser/resources/chromeos/chromevox/cvox2/background/background.js
@@ -581,6 +581,11 @@ Background.prototype = {
    *                                     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