[C++11 Allowed Features] Declares a type-safe null pointer converting from NULL to nullptr

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 116 matching lines @@
 
 - (id)initWithObject:(BrowserAccessibility*)accessibility {
   if ((self = [super init]))
     browserAccessibility_ = accessibility;
   return self;
 }
 
 - (void)detach {
   if (browserAccessibility_) {
     NSAccessibilityUnregisterUniqueIdForUIElement(self);
-    browserAccessibility_ = NULL;
+    browserAccessibility_ = nullptr;
   }
 }
 
 - (NSString*)accessKey {
   return NSStringForStringAttribute(
       browserAccessibility_, ui::AX_ATTR_ACCESS_KEY);
 }
 
 - (NSNumber*)ariaAtomic {
   bool boolValue = browserAccessibility_->GetBoolAttribute(
@@ skipping 177 matching lines @@
 }
 
 - (NSNumber*)enabled {
   return [NSNumber numberWithBool:
       GetState(browserAccessibility_, ui::AX_STATE_ENABLED)];
 }
 
 - (NSNumber*)focused {
   BrowserAccessibilityManager* manager = browserAccessibility_->manager();
   NSNumber* ret = [NSNumber numberWithBool:
-      manager->GetFocus(NULL) == browserAccessibility_];
+      manager->GetFocus(nullptr) == browserAccessibility_];
   return ret;
 }
 
 - (id)header {
   int headerElementId = -1;
   if ([self internalRole] == ui::AX_ROLE_TABLE ||
       [self internalRole] == ui::AX_ROLE_GRID) {
     browserAccessibility_->GetIntAttribute(
         ui::AX_ATTR_TABLE_HEADER_ID, &headerElementId);
   } else if ([self internalRole] == ui::AX_ROLE_COLUMN) {
@@ skipping 34 matching lines @@
 
 // Returns whether or not this node should be ignored in the
 // accessibility tree.
 - (BOOL)isIgnored {
   return [[self role] isEqualToString:NSAccessibilityUnknownRole];
 }
 
 - (NSString*)invalid {
   base::string16 invalidUTF;
   if (!browserAccessibility_->GetHtmlAttribute("aria-invalid", &invalidUTF))
-    return NULL;
+    return nullptr;
   NSString* invalid = base::SysUTF16ToNSString(invalidUTF);
   if ([invalid isEqualToString:@"false"] ||
       [invalid isEqualToString:@""]) {
     return @"false";
   }
   return invalid;
 }
 
 - (void)addLinkedUIElementsFromAttribute:(ui::AXIntListAttribute)attribute
                                    addTo:(NSMutableArray*)outArray {
@@ skipping 1045 matching lines @@
     return [super hash];
   return browserAccessibility_->GetId();
 }
 
 - (BOOL)accessibilityShouldUseUniqueId {
   return YES;
 }
 
 @end