[Mac] Remove native/Cocoa preferences.

chrome/browser/autofill/autofill_text_field_mac.h

Index: chrome/browser/autofill/autofill_text_field_mac.h
diff --git a/chrome/browser/autofill/autofill_text_field_mac.h b/chrome/browser/autofill/autofill_text_field_mac.h
deleted file mode 100644
index 385c59f520dc2558c46f279390143b405123f82d..0000000000000000000000000000000000000000
--- a/chrome/browser/autofill/autofill_text_field_mac.h
+++ /dev/null
@@ -1,27 +0,0 @@
-// 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.
-
-#ifndef CHROME_BROWSER_AUTOFILL_AUTOFILL_TEXT_FIELD_MAC_
-#define CHROME_BROWSER_AUTOFILL_AUTOFILL_TEXT_FIELD_MAC_
-#pragma once
-
-#import <Cocoa/Cocoa.h>
-
-#import "base/scoped_nsobject.h"
-
-// Subclass of NSTextField with special abilities:
-// - automatically scrolls containing NSScrollView to visually reveal itself
-//   on focus
-// - properly obfuscates credit card numbers
-
-@interface AutoFillTextField : NSTextField {
-  BOOL isCreditCardField_;
-  BOOL isObfuscated_;
-  BOOL isBeingSelected_;
-
-  scoped_nsobject<NSString> obfuscatedValue_;
-}
-@end
-
-#endif // CHROME_BROWSER_AUTOFILL_AUTOFILL_TEXT_FIELD_MAC_