chrome: Cleanup class/struct forward declarations

chrome/browser/importer/external_process_importer_host.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_IMPORTER_EXTERNAL_PROCESS_IMPORTER_HOST_H_
 #define CHROME_BROWSER_IMPORTER_EXTERNAL_PROCESS_IMPORTER_HOST_H_
 
 #include <stdint.h>
 
 #include <memory>
 
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
 #include "chrome/browser/importer/importer_progress_observer.h"
 #include "chrome/browser/importer/profile_writer.h"
 #include "chrome/common/importer/importer_data_types.h"
 #include "components/bookmarks/browser/base_bookmark_model_observer.h"
 #include "components/search_engines/template_url_service.h"
 #include "ui/gfx/native_widget_types.h"
 
 class ExternalProcessImporterClient;
 class FirefoxProfileLock;
-class Importer;
 class Profile;
 
 namespace importer {
 struct SourceProfile;
 }
 
 // This class manages the import process. It creates the in-process half of the
 // importer bridge and the external process importer client.
 class ExternalProcessImporterHost
     : public bookmarks::BaseBookmarkModelObserver {
@@ skipping 123 matching lines @@
   // True if the import process has been cancelled.
   bool cancelled_;
 
   // Vends weak pointers for the importer to call us back.
   base::WeakPtrFactory<ExternalProcessImporterHost> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ExternalProcessImporterHost);
 };
 
 #endif  // CHROME_BROWSER_IMPORTER_EXTERNAL_PROCESS_IMPORTER_HOST_H_