Fix some minor typos related to the word "accessibility".

ui/keyboard/resources/elements/kb-keyboard.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.
 
 /**
  * The repeat delay in milliseconds before a key starts repeating. Use the
  * same rate as Chromebook.
  * (See chrome/browser/chromeos/language_preferences.cc)
  * @const
  * @type {number}
@@ skipping 350 matching lines @@
   addKeysetChangedObserver: function(callback) {
     this.addEventListener('stateChange', callback);
   },
 
   /**
    * Called when the type of focused input box changes. If a keyboard layout
    * is defined for the current input type, that layout will be loaded.
    * Otherwise, the keyboard layout for 'text' type will be loaded.
    */
   inputTypeChanged: function() {
-    // Disable layout switching at accessbility mode.
+    // Disable layout switching at accessibility mode.
     if (this.config && this.config.a11ymode)
       return;
 
     // TODO(bshe): Toggle visibility of some keys in a keyboard layout
     // according to the input type.
     var layout = this.inputTypeToLayoutMap[this.inputType];
     if (!layout)
       layout = this.inputTypeToLayoutMap.text;
     this.layout = layout;
   },
@@ skipping 586 matching lines @@
            keyboardLoaded();
            return true;
          }
       }
     }
     if (keysetsLoaded)
       console.error('No default keyset found for ' + this.layout);
     return false;
   }
 });