chrome: Cleanup class/struct forward declarations

chrome/browser/extensions/api/cookies/cookies_helpers.h

 // 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.
 
 // Defines common functionality used by the implementation of the Chrome
 // Extensions Cookies API implemented in
 // chrome/browser/extensions/api/cookies/cookies_api.cc. This separate interface
 // exposes pieces of the API implementation mainly for unit testing purposes.
 
 #ifndef CHROME_BROWSER_EXTENSIONS_API_COOKIES_COOKIES_HELPERS_H_
 #define CHROME_BROWSER_EXTENSIONS_API_COOKIES_COOKIES_HELPERS_H_
 
 #include <string>
 #include <vector>
 
 #include "chrome/common/extensions/api/cookies.h"
 #include "net/cookies/cookie_monster.h"
 #include "net/cookies/canonical_cookie.h"
 
 class Browser;
 class Profile;
 
 namespace base {
-class DictionaryValue;
 class ListValue;
 }
 
 namespace net {
 class CanonicalCookie;
 }
 
 namespace extensions {
 
 class Extension;
@@ skipping 75 matching lines @@
   // 'foo.bar.com', '.foo.bar.com', and 'baz.foo.bar.com'.
   bool MatchesDomain(const std::string& domain);
 
   const api::cookies::GetAll::Params::Details* details_;
 };
 
 }  // namespace cookies_helpers
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_API_COOKIES_COOKIES_HELPERS_H_