Allow panels to be created as detached panels.

chrome/browser/ui/panels/panel_titlebar_view_cocoa.mm

 // Copyright (c) 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.
 
 #import "chrome/browser/ui/panels/panel_titlebar_view_cocoa.h"
 
 #include <Carbon/Carbon.h>  // kVK_Escape
 #import <Cocoa/Cocoa.h>
 
 #include "base/logging.h"
@@ skipping 308 matching lines @@
       image:rb.GetNativeImageNamed(IDR_PANEL_MINIMIZE)
       hoverImage:rb.GetNativeImageNamed(IDR_PANEL_MINIMIZE_H)
       pressedImage:rb.GetNativeImageNamed(IDR_PANEL_MINIMIZE_C)
       toolTip:l10n_util::GetNSStringWithFixup(IDS_PANEL_MINIMIZE_TOOLTIP)];
 
   [self initializeImageButton:restoreButton_
       image: rb.GetNativeImageNamed(IDR_PANEL_RESTORE)
       hoverImage:rb.GetNativeImageNamed(IDR_PANEL_RESTORE_H)
       pressedImage:rb.GetNativeImageNamed(IDR_PANEL_RESTORE_C)
       toolTip:l10n_util::GetNSStringWithFixup(IDS_PANEL_RESTORE_TOOLTIP)];
-  [restoreButton_ setHidden:YES];  // Only visible when panel is minimized.
+
+  [controller_ updateTitleBarMinimizeRestoreButtonVisibility];
 
   [self updateCustomButtonsLayout];
 
   // Set autoresizing behavior: glued to edges on left, top and right.
   [self setAutoresizingMask:(NSViewMinYMargin | NSViewWidthSizable)];
 
   [[NSNotificationCenter defaultCenter]
       addObserver:self
          selector:@selector(didChangeTheme:)
              name:kBrowserThemeDidChangeNotification
@@ skipping 342 matching lines @@
 - (NSButton*)minimizeButton {
   return minimizeButton_;
 }
 
 - (NSButton*)restoreButton {
   return restoreButton_;
 }
 
 @end