Reduce BrowsingDataRemover's dependencies on Chrome

chrome/browser/browsing_data/chrome_browsing_data_remover_delegate.h

 // Copyright 2016 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_BROWSING_DATA_CHROME_BROWSING_DATA_REMOVER_DELEGATE_H_
 #define CHROME_BROWSER_BROWSING_DATA_CHROME_BROWSING_DATA_REMOVER_DELEGATE_H_
 
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
 #include "base/synchronization/waitable_event_watcher.h"
 #include "base/task/cancelable_task_tracker.h"
 #include "chrome/browser/browsing_data/browsing_data_remover.h"
 #include "chrome/browser/browsing_data/browsing_data_remover_delegate.h"
 #include "chrome/common/features.h"
 #include "components/browsing_data/core/browsing_data_utils.h"
 #include "components/offline_pages/core/offline_page_model.h"
 #include "components/search_engines/template_url_service.h"
 #include "media/media_features.h"
 #include "ppapi/features/features.h"
 
 #if BUILDFLAG(ENABLE_PLUGINS)
 #include "chrome/browser/pepper_flash_settings_manager.h"
 #endif
 
 #if defined(OS_CHROMEOS)
 #include "chromeos/dbus/dbus_method_call_status.h"
 #endif
 
+class Profile;
 class WebappRegistry;
 
 // A delegate used by BrowsingDataRemover to delete data specific to Chrome
 // as the embedder.
 class ChromeBrowsingDataRemoverDelegate : public BrowsingDataRemoverDelegate
 #if BUILDFLAG(ENABLE_PLUGINS)
     , public PepperFlashSettingsManager::Client
 #endif
 {
  public:
@@ skipping 101 matching lines @@
   // not initialised, so the registry must be mocked out.
   std::unique_ptr<WebappRegistry> webapp_registry_;
 #endif
 
   base::WeakPtrFactory<ChromeBrowsingDataRemoverDelegate> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ChromeBrowsingDataRemoverDelegate);
 };
 
 #endif  // CHROME_BROWSER_BROWSING_DATA_CHROME_BROWSING_DATA_REMOVER_DELEGATE_H_