Remove a couple of unneeded forwarded decls.

BUG=none
TEST=builds

Review URL: http://codereview.chromium.org/3012046

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@55029 0039d316-1c4b-4281-b951-d872f2087c98

chrome/browser/browser_theme_provider.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.
 
@@ -20,10 +20,8 @@ namespace color_utils {
 
 class BrowserThemePack;
 class BrowserThemeProviderTest;
-class DictionaryValue;
 class Extension;
 class FilePath;
-class PrefService;
 class Profile;
 class ResourceBundle;