Update AutocompleteTextFieldEditor to use non-deprecated dragging APIs.

ui/base/clipboard/clipboard_util_mac.h

 // Copyright 2016 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 UI_BASE_CLIPBOARD_CLIPBOARD_UTIL_MAC_H_
 #define UI_BASE_CLIPBOARD_CLIPBOARD_UTIL_MAC_H_
 
 #import <AppKit/AppKit.h>
 
 #include "base/mac/scoped_nsobject.h"
@@ skipping 16 matching lines @@
 };
 
 class UI_BASE_EXPORT ClipboardUtil {
  public:
   // Returns an NSPasteboardItem that represents the given |url|.
   // |url| must not be nil.
   // If |title| is nil, |url| is used in its place.
   static base::scoped_nsobject<NSPasteboardItem> PasteboardItemFromUrl(
       NSString* url,
       NSString* title);
+
+  // Returns an NSPasteboardItem that represents the given string.
+  // |string| must not be nil.
+  static base::scoped_nsobject<NSPasteboardItem> PasteboardItemFromString(
+      NSString* string);
+
+  // Returns the title or url associated with a NSPasteboard which contains an
+  // url NSPasteboardItem.
+  static NSString* GetTitleFromPasteboardURL(NSPasteboard* pboard);
+  static NSString* GetURLFromPasteboardURL(NSPasteboard* pboard);
 };
 }
 
 #endif  // UI_BASE_CLIPBOARD_CLIPBOARD_UTIL_MAC_H_