Make accelerators not to work when the keyboard overlay is shown.

chrome/browser/resources/chromeos/keyboard_overlay.js

 // Copyright (c) 2012 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.
 
 <include src="keyboard_overlay_data.js"/>
 <include src="keyboard_overlay_accessibility_helper.js"/>
 
 var BASE_KEYBOARD = {
   top: 0,
   left: 0,
@@ skipping 290 matching lines @@
      }
     if (isAscii(keyLabel) &&
         getShortcutData()[getAction(keyLabel, modifiers)]) {
       break;
     }
   }
   return keyLabel;
 }
 
 /**
- * Returns the label corresponding to the key code.
- * @param {string} keyCode Key code
- * @return {string} Label of the key code.
- */
-function getKeyLabelFromKeyCode(keyCode) {
-  if ('0'.charCodeAt(0) <= keyCode && keyCode <= 'Z'.charCodeAt(0))
-    return String.fromCharCode(keyCode).toLowerCase();
-  var label = KEYCODE_TO_LABEL[keyCode];
-  if (label)
-    return label;
-  return '';
-}
-
-/**
  * Returns a normalized string used for a key of shortcutData.
  *
  * Examples:
  *   keyCode: 'd', modifiers: ['CTRL', 'SHIFT'] => 'd<>CTRL<>SHIFT'
  *   keyCode: 'alt', modifiers: ['ALT', 'SHIFT'] => 'ALT<>SHIFT'
  *
  * @param {string} keyCode Key code.
  * @param {Array} modifiers Key Modifier list.
  * @return {string} Normalized key shortcut data string.
  */
@@ skipping 106 matching lines @@
 }
 
 /**
  * A callback function for onkeydown and onkeyup events.
  * @param {Event} e Key event.
  */
 function handleKeyEvent(e) {
   if (!getKeyboardOverlayId()) {
     return;
   }
-  var label = getKeyLabelFromKeyCode(e.keyCode);
   var modifiers = getModifiers(e);
-  var shortcutData = getShortcutData();
-  var action = getAction(label, modifiers);
-  if (e.type == 'keydown' &&
-      (contains(CLOSE_LABELS, label) || shortcutData[action])) {
-    chrome.send('DialogClose');
-    return;
-  }
   update(modifiers);
   KeyboardOverlayAccessibilityHelper.maybeSpeakAllShortcuts(modifiers);
   e.preventDefault();
 }
 
 /**
  * Initializes the layout of the keys.
  */
 function initLayout() {
   // Add data for the caps lock key
@@ skipping 153 matching lines @@
  * Handles click events of the learn more link.
  * @param {Event} e Mouse click event.
  */
 function learnMoreClicked(e) {
   chrome.send('openLearnMorePage');
   chrome.send('DialogClose');
   e.preventDefault();
 }
 
 document.addEventListener('DOMContentLoaded', init);