[Mac] Integrate divider into browser-action overflow chevron.

chrome/browser/cocoa/extensions/chevron_menu_button.h

Index: chrome/browser/cocoa/extensions/chevron_menu_button.h
diff --git a/chrome/browser/cocoa/extensions/chevron_menu_button.h b/chrome/browser/cocoa/extensions/chevron_menu_button.h
new file mode 100644
index 0000000000000000000000000000000000000000..ea4ccc2d604ff5d851996c3460d1bace270262f5
--- /dev/null
+++ b/chrome/browser/cocoa/extensions/chevron_menu_button.h
@@ -0,0 +1,19 @@
+// 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_COCOA_EXTENSIONS_CHEVRON_MENU_BUTTON_H_
+#define CHROME_BROWSER_COCOA_EXTENSIONS_CHEVRON_MENU_BUTTON_H_
+#pragma once
+
+#import "chrome/browser/cocoa/menu_button.h"
+
+@interface ChevronMenuButton : MenuButton {
+}
+
+// Overrides cell class with |ChevronMenuButtonCell|.
++ (Class)cellClass;
+
+@end
+
+#endif  // CHROME_BROWSER_COCOA_EXTENSIONS_CHEVRON_MENU_BUTTON_H_