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

chrome/browser/signin/screenlock_bridge.h

 // 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.
 
 #ifndef CHROME_BROWSER_SIGNIN_SCREENLOCK_BRIDGE_H_
 #define CHROME_BROWSER_SIGNIN_SCREENLOCK_BRIDGE_H_
 
 #include <string>
 
 #include "base/basictypes.h"
@@ skipping 46 matching lines @@
     // screenlock web UI.
     scoped_ptr<base::DictionaryValue> ToDictionaryValue() const;
 
     // Sets the icon that should be shown in the UI.
     void SetIcon(UserPodCustomIcon icon);
 
     // Sets the icon tooltip. If |autoshow| is set the tooltip is automatically
     // shown with the icon.
     void SetTooltip(const base::string16& tooltip, bool autoshow);
 
-    // Sets the accessiblity label of the icon. If this attribute is not
+    // Sets the accessibility label of the icon. If this attribute is not
     // provided, then the tooltip will be used.
     void SetAriaLabel(const base::string16& aria_label);
 
     // If hardlock on click is set, clicking the icon in the screenlock will
     // go to state where password is required for unlock.
     void SetHardlockOnClick();
 
    private:
     UserPodCustomIcon icon_;
 
@@ skipping 80 matching lines @@
 
   LockHandler* lock_handler_;  // Not owned
   // The last focused user's id.
   std::string focused_user_id_;
   ObserverList<Observer, true> observers_;
 
   DISALLOW_COPY_AND_ASSIGN(ScreenlockBridge);
 };
 
 #endif  // CHROME_BROWSER_SIGNIN_SCREENLOCK_BRIDGE_H_