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diff --git a/chrome/browser/cocoa/about_window_controller.h b/chrome/browser/cocoa/about_window_controller.h
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+++ b/chrome/browser/cocoa/about_window_controller.h
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+// 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_ABOUT_WINDOW_CONTROLLER_MAC_H_
+#define CHROME_BROWSER_COCOA_ABOUT_WINDOW_CONTROLLER_MAC_H_
+
+#import <Cocoa/Cocoa.h>
+#import "chrome/app/keystone_glue.h"
+
+@class AppController;
+
+// A window controller that handles the branded (Chrome.app) about
+// window.  The branded about window has a few features beyond the
+// standard Cocoa about panel.  For example, opening the about window
+// will check to see if this version is current and tell the user.
+// There is also an "update me now" button with a progress spinner.
+@interface AboutWindowController : NSWindowController<KeystoneGlueCallbacks> {
+ @private
+  IBOutlet NSTextField* version_;
+  IBOutlet NSTextField* upToDate_;
+  IBOutlet NSTextField* updateCompleted_;
+  IBOutlet NSProgressIndicator* spinner_;
+  IBOutlet NSButton* updateNowButton_;
+
+  BOOL updateTriggered_;  // Has an update ever been triggered?
+}
+
+// Trigger an update right now, as initiated by a button.
+- (IBAction)updateNow:(id)sender;
+
+@end
+
+
+@interface AboutWindowController (JustForTesting)
+- (NSButton*)updateButton;
+- (NSTextField*)upToDateTextField;
+- (NSTextField*)updateCompletedTextField;
+@end
+
+
+// NSNotification sent when the about window is closed.
+extern NSString* const kUserClosedAboutNotification;
+
+#endif