Dismiss context menu when download bar is closed.

chrome/browser/ui/cocoa/download/download_item_button.h

Index: chrome/browser/ui/cocoa/download/download_item_button.h
diff --git a/chrome/browser/ui/cocoa/download/download_item_button.h b/chrome/browser/ui/cocoa/download/download_item_button.h
index e0124913885ae0ec4c59bfeb553794865cb4823d..33646d7e73dc1278ded01cf389cbece9f00d3442 100644
--- a/chrome/browser/ui/cocoa/download/download_item_button.h
+++ b/chrome/browser/ui/cocoa/download/download_item_button.h
@@ -1,4 +1,4 @@
-// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Copyright 2012 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.
 
@@ -17,11 +17,15 @@
  @private
   base::FilePath downloadPath_;
   DownloadItemController* controller_;  // weak
+  base::scoped_nsobject<NSMenu> contextMenu_;
 }
 
 @property(assign, nonatomic) base::FilePath download;
 @property(assign, nonatomic) DownloadItemController* controller;
 
+// Shows the DownloadItemButton's context menu.
+- (void)showContextMenu;
+
 // Overridden from DraggableButton.
 - (void)beginDrag:(NSEvent*)event;