Use delegate protocols present in the 10.6 SDK

chrome/browser/cocoa/download_item_cell.h

 // Copyright (c) 2009 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_COCOA_DOWNLOAD_ITEM_CELL_H_
 #define CHROME_BROWSER_COCOA_DOWNLOAD_ITEM_CELL_H_
 
+#import "base/cocoa_protocols_mac.h"
 #import "chrome/browser/cocoa/gradient_button_cell.h"
 
 #include "base/file_path.h"
 
 class BaseDownloadItemModel;
 
 // A button cell that implements the weird button/popup button hybrid that is
 // used by the download items.
 
 // The button represented by this cell consists of a button part on the left
 // and a dropdown-menu part on the right. This enum describes which part the
 // mouse cursor is over currently.
 enum DownloadItemMousePosition {
   kDownloadItemMouseOutside,
   kDownloadItemMouseOverButtonPart,
   kDownloadItemMouseOverDropdownPart
 };
 
-@interface DownloadItemCell : GradientButtonCell {
+@interface DownloadItemCell : GradientButtonCell<NSAnimationDelegate> {
  @private
   // Track which part of the button the mouse is over
   DownloadItemMousePosition mousePosition_;
   int mouseInsideCount_;
   scoped_nsobject<NSTrackingArea> trackingAreaButton_;
   scoped_nsobject<NSTrackingArea> trackingAreaDropdown_;
 
   FilePath downloadPath_;  // stored unelided
   NSString* secondaryTitle_;
   NSFont* secondaryFont_;
@@ skipping 12 matching lines @@
 @property (retain) NSFont* secondaryFont;
 
 // Valid to call in response to a click of the cell's button. Returns if the
 // button part of the cell was clicked.
 - (BOOL)isButtonPartPressed;
 
 @end
 
 #endif  // CHROME_BROWSER_COCOA_DOWNLOAD_ITEM_CELL_H_