Remove obviously unneeded forward declarations in chrome/browser/[abef]*/*.h.

chrome/browser/extensions/gtk_theme_installed_infobar_delegate.h

-// Copyright (c) 2009 The Chromium Authors. All rights reserved.
+// 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_EXTENSIONS_GTK_THEME_INSTALLED_INFOBAR_DELEGATE_H_
 #define CHROME_BROWSER_EXTENSIONS_GTK_THEME_INSTALLED_INFOBAR_DELEGATE_H_
 #pragma once
 
 #include "chrome/browser/extensions/theme_installed_infobar_delegate.h"
 
 #include <string>
 
 class Extension;
-class SkBitmap;
 class TabContents;
 
 // A specialization of ThemeInstalledInfoBarDelegate to make "Undo" reset to the
 // GTK theme if the user was in GTK theme mode before installing the theme.
 class GtkThemeInstalledInfoBarDelegate : public ThemeInstalledInfoBarDelegate {
  public:
   GtkThemeInstalledInfoBarDelegate(TabContents* tab_contents,
                                    const Extension* new_theme,
                                    const std::string& previous_theme_id,
                                    bool previous_use_gtk_theme);
   virtual bool Cancel();
 
  private:
   bool previous_use_gtk_theme_;
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_GTK_THEME_INSTALLED_INFOBAR_DELEGATE_H_