Revert 49984 - patch from issue 2762014

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
@@ skipping 10 matching lines @@
   // Vertical inset is negative to indicate "outset".  Provides some visual
   // space above and below when tabbing between fields.
   const CGFloat kVerticalInset = -40.0;
   BOOL becoming = [super becomeFirstResponder];
   if (becoming) {
     [self scrollRectToVisible:NSInsetRect([self bounds], 0.0, kVerticalInset)];
   }
   return becoming;
 }
 
-- (void)setObjectValue:(id<NSCopying>)object {
-// FIXME
-  if (isCreditCardField_ &&
-      [(NSObject*)object isKindOfClass:[NSString class]]) {
+- (void)setObjectValue:(id)object {
+  if (isCreditCardField_ && [object isKindOfClass:[NSString class]]) {
     // Obfuscate the number.
-    NSString* string = (NSString*)object;  // FIXME: NSMutableCopying
+    NSString* string = 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 29 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