Make GConf dependency optional.

chrome/browser/gtk/browser_titlebar.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.
 //
 // A helper class that contains the gtk widgets that make up the titlebar.  The
 // titlebar consists of the tabstrip and if the custom chrome frame is turned
 // on, it includes the taller titlebar and minimize, restore, maximize, and
 // close buttons.
 
 #ifndef CHROME_BROWSER_GTK_BROWSER_TITLEBAR_H_
@@ skipping 13 matching lines @@
 class CustomDrawButton;
 class GtkThemeProvider;
 class MenuGtk;
 class PopupPageMenuModel;
 class TabContents;
 
 class BrowserTitlebar : public NotificationObserver,
                         public ActiveWindowWatcherX::Observer,
                         public menus::SimpleMenuModel::Delegate {
  public:
+  // A default button order string for when we aren't asking gconf for the
+  // metacity configuration.
+  static const char kDefaultButtonString[];
+
   BrowserTitlebar(BrowserWindowGtk* browser_window, GtkWindow* window);
   virtual ~BrowserTitlebar();
 
   GtkWidget* widget() {
     return container_;
   }
 
   void set_window(GtkWindow* window) { window_ = window; }
 
   // Builds the buttons based on the metacity |button_string|.
@@ skipping 182 matching lines @@
   // The throbber used when the window is in app mode or popup window mode.
   Throbber throbber_;
 
   // Theme provider for building buttons.
   GtkThemeProvider* theme_provider_;
 
   NotificationRegistrar registrar_;
 };
 
 #endif  // CHROME_BROWSER_GTK_BROWSER_TITLEBAR_H_