chrome: Cleanup class/struct forward declarations

chrome/browser/extensions/permissions_updater.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.
 
 #ifndef CHROME_BROWSER_EXTENSIONS_PERMISSIONS_UPDATER_H__
 #define CHROME_BROWSER_EXTENSIONS_PERMISSIONS_UPDATER_H__
 
 #include <memory>
 #include <string>
 
 #include "base/macros.h"
 #include "extensions/browser/extension_event_histogram_value.h"
 
-namespace base {
-class DictionaryValue;
-}
-
 namespace content {
 class BrowserContext;
 }
 
 namespace extensions {
 
 class Extension;
-class ExtensionPrefs;
 class PermissionSet;
 
 // Updates an Extension's active and granted permissions in persistent storage
 // and notifies interested parties of the changes.
 class PermissionsUpdater {
  public:
   enum InitFlag {
     INIT_FLAG_NONE = 0,
     INIT_FLAG_TRANSIENT = 1 << 0,
   };
@@ skipping 81 matching lines @@
   // Initialization flag that determines whether prefs is consulted about the
   // extension. Transient extensions should not have entries in prefs.
   InitFlag init_flag_;
 
   DISALLOW_COPY_AND_ASSIGN(PermissionsUpdater);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_PERMISSIONS_UPDATER_H__