chrome: Cleanup class/struct forward declarations

chrome/browser/extensions/extension_util.h

 // Copyright 2013 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_EXTENSION_UTIL_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_UTIL_H_
 
 #include <memory>
 #include <string>
 
 #include "url/gurl.h"
 
 namespace base {
 class DictionaryValue;
 }
 
 namespace content {
 class BrowserContext;
 }
 
 namespace gfx {
 class ImageSkia;
 }
 
 class Profile;
 
 namespace extensions {
 
 class Extension;
-struct ExtensionInfo;
-class PermissionSet;
 
 namespace util {
 
 // Returns true if |extension_id| can run in an incognito window.
 bool IsIncognitoEnabled(const std::string& extension_id,
                         content::BrowserContext* context);
 
 // Sets whether |extension_id| can run in an incognito window. Reloads the
 // extension if it's enabled since this permission is applied at loading time
 // only. Note that an ExtensionService must exist.
@@ skipping 77 matching lines @@
 // open in window is stable on Mac.
 bool CanHostedAppsOpenInWindows();
 
 // Returns true for custodian-installed extensions in a supervised profile.
 bool IsExtensionSupervised(const Extension* extension, Profile* profile);
 
 }  // namespace util
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_UTIL_H_