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

content/browser/accessibility/browser_accessibility_cocoa.mm

 // 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 <execinfo.h>
 
 #import "content/browser/accessibility/browser_accessibility_cocoa.h"
 
 #include <map>
 
@@ skipping 1343 matching lines @@
         ui::AX_ATTR_CAN_SET_VALUE);
   }
   if ([attribute isEqualToString:NSAccessibilitySelectedTextRangeAttribute] &&
       ([[self role] isEqualToString:NSAccessibilityTextFieldRole] ||
        [[self role] isEqualToString:NSAccessibilityTextAreaRole]))
     return YES;
 
   return NO;
 }
 
-// Returns whether or not this object should be ignored in the accessibilty
+// Returns whether or not this object should be ignored in the accessibility
 // tree.
 - (BOOL)accessibilityIsIgnored {
   if (!browserAccessibility_)
     return true;
 
   return [self isIgnored];
 }
 
-// Performs the given accessibilty action on the webkit accessibility object
+// Performs the given accessibility action on the webkit accessibility object
 // that backs this object.
 - (void)accessibilityPerformAction:(NSString*)action {
   if (!browserAccessibility_)
     return;
 
   // TODO(dmazzoni): Support more actions.
   if ([action isEqualToString:NSAccessibilityPressAction]) {
     [self delegate]->AccessibilityDoDefaultAction(
         browserAccessibility_->GetId());
   } else if ([action isEqualToString:NSAccessibilityShowMenuAction]) {
@@ skipping 82 matching lines @@
     return [super hash];
   return browserAccessibility_->GetId();
 }
 
 - (BOOL)accessibilityShouldUseUniqueId {
   return YES;
 }
 
 @end