Mac: clang build

chrome/browser/autofill/autofill_text_field_mac.mm

 // Copyright (c) 2010 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.
 
 #import "chrome/browser/autofill/autofill_text_field_mac.h"
 
 #include "base/sys_string_conversions.h"
 #include "chrome/browser/autofill/credit_card.h"
 
 @implementation AutoFillTextField
 
 - (void)awakeFromNib {
   // Fields tagged with this value in the nib file will be treated as credit
   // card number fields.
   const int kAutoFillCreditCardTag = 22;
 
   if ([self tag] == kAutoFillCreditCardTag) {
     isCreditCardField_ = YES;
 
     // KVO bindings initialize fields prior to |awakeFromNib|.  In the credit
     // card field case we need to re-initialize the value to the obfuscated
     // version.
     [self setObjectValue:[self objectValue]];
   }
 }
 
-- (void)setObjectValue:(id)object {
-  if (isCreditCardField_ && [object isKindOfClass:[NSString class]]) {
+- (void)setObjectValue:(id<NSCopying>)anObject {
+  // -[NSControl setObjectValue:] says that the passed-in object has type
+  // |id<NSCopying>|, but this function needs to call the NSObject method
+  // -isKindOfClass: on the parameter. In theory, this is not correct, but this
+  // is probably a bug in the method signature.
+  NSObject<NSCopying>* object = static_cast<NSObject<NSCopying>*>(anObject);
+  if (isCreditCardField_ &&
+      [object isKindOfClass:[NSString class]]) {
     // Obfuscate the number.
-    NSString* string = object;
+    NSString* string = static_cast<NSString*>(object);
     CreditCard card;
     card.SetInfo(AutoFillType(CREDIT_CARD_NUMBER),
                  base::SysNSStringToUTF16(string));
     NSString* starredString = base::SysUTF16ToNSString(card.ObfuscatedNumber());
 
     [super setObjectValue:starredString];
     isObfuscated_ = YES;
     obfuscatedValue_.reset([string copy]);
   } else {
     [super setObjectValue:object];
@@ skipping 30 matching lines @@
 - (BOOL)textShouldBeginEditing:(NSText*)textObject {
   BOOL should = [super textShouldBeginEditing:textObject];
   // On editing, since everything is selected, the field is now clear.
   isObfuscated_ = !should;
   if (!isObfuscated_)
     obfuscatedValue_.reset();
   return should;
 }
 
 @end