chrome: Cleanup class/struct forward declarations

chrome/browser/chromeos/platform_keys/platform_keys_service.h

 // Copyright 2014 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_CHROMEOS_PLATFORM_KEYS_PLATFORM_KEYS_SERVICE_H_
 #define CHROME_BROWSER_CHROMEOS_PLATFORM_KEYS_PLATFORM_KEYS_SERVICE_H_
 
 #include <memory>
 #include <queue>
 #include <string>
 #include <vector>
 
 #include "base/callback_forward.h"
 #include "base/macros.h"
 #include "base/memory/linked_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "chrome/browser/chromeos/platform_keys/key_permissions.h"
 #include "chrome/browser/chromeos/platform_keys/platform_keys.h"
 #include "components/keyed_service/core/keyed_service.h"
 
 class PrefService;
 
-namespace base {
-class ListValue;
-class Value;
-}
-
 namespace content {
 class BrowserContext;
 class WebContents;
 }
 
 namespace extensions {
 class StateStore;
 }
 
 namespace net {
@@ skipping 183 matching lines @@
   std::unique_ptr<SelectDelegate> select_delegate_;
   std::queue<linked_ptr<Task>> tasks_;
   base::WeakPtrFactory<PlatformKeysService> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(PlatformKeysService);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_PLATFORM_KEYS_PLATFORM_KEYS_SERVICE_H_