Remove a couple of unneeded forwarded decls.

chrome/browser/browser_theme_provider.h

Index: chrome/browser/browser_theme_provider.h
diff --git a/chrome/browser/browser_theme_provider.h b/chrome/browser/browser_theme_provider.h
index c5fe48f50a51883f6aa7a48bf353fe35641f524d..da2db5b1d02592fef9e3b91f19a59ecaba7e2d74 100644
--- a/chrome/browser/browser_theme_provider.h
+++ b/chrome/browser/browser_theme_provider.h
@@ -1,4 +1,4 @@
-// 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;