extensions: Cleanup class/struct fwd declarations

extensions/browser/api/management/management_api_delegate.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 EXTENSIONS_BROWSER_API_MANAGEMENT_MANAGEMENT_API_DELEGATER_H_
 #define EXTENSIONS_BROWSER_API_MANAGEMENT_MANAGEMENT_API_DELEGATER_H_
 
 #include "base/callback.h"
 #include "extensions/browser/uninstall_reason.h"
 #include "extensions/common/constants.h"
 #include "extensions/common/extension.h"
 #include "extensions/common/extension_icon_set.h"
 #include "url/gurl.h"
 
 namespace content {
 class BrowserContext;
 class WebContents;
 }  // namespace content
 
 namespace extensions {
 
 class Extension;
 class ExtensionPrefs;
 class ManagementCreateAppShortcutFunction;
 class ManagementGenerateAppForLinkFunction;
 class ManagementGetPermissionWarningsByManifestFunction;
-class ManagementSetEnabledFunction;
 class ManagementUninstallFunctionBase;
 class RequirementsChecker;
 
 // Manages the lifetime of the install prompt.
 class InstallPromptDelegate {
  public:
   virtual ~InstallPromptDelegate() {}
 };
 
 // Manages the lifetime of the uninstall prompt.
@@ skipping 96 matching lines @@
   virtual GURL GetIconURL(const Extension* extension,
                           int icon_size,
                           ExtensionIconSet::MatchType match,
                           bool grayscale,
                           bool* exists) const = 0;
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_BROWSER_API_MANAGEMENT_MANAGEMENT_API_DELEGATER_H_