chrome: Cleanup class/struct forward declarations

chrome/browser/ui/webui/settings/people_handler.h

 // Copyright 2015 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_UI_WEBUI_SETTINGS_PEOPLE_HANDLER_H_
 #define CHROME_BROWSER_UI_WEBUI_SETTINGS_PEOPLE_HANDLER_H_
 
 #include <memory>
 #include <string>
 
@@ skipping 11 matching lines @@
 #include "components/sync/driver/sync_service_observer.h"
 
 class LoginUIService;
 class SigninManagerBase;
 
 namespace browser_sync {
 class ProfileSyncService;
 }  // namespace browser_sync
 
 namespace content {
-class WebContents;
 class WebUI;
 }  // namespace content
 
 namespace signin_metrics {
 enum class AccessPoint;
 }  // namespace signin_metrics
 
 namespace syncer {
 class SyncSetupInProgressHandle;
 }  // namespace syncer
@@ skipping 158 matching lines @@
   ScopedObserver<SigninManagerBase, PeopleHandler> signin_observer_;
   ScopedObserver<browser_sync::ProfileSyncService, PeopleHandler>
       sync_service_observer_;
 
   DISALLOW_COPY_AND_ASSIGN(PeopleHandler);
 };
 
 }  // namespace settings
 
 #endif  // CHROME_BROWSER_UI_WEBUI_SETTINGS_PEOPLE_HANDLER_H_