components: Cleanup class/struct fwd declarations

components/filesystem/file_system_impl.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 COMPONENTS_FILESYSTEM_FILE_SYSTEM_IMPL_H_
 #define COMPONENTS_FILESYSTEM_FILE_SYSTEM_IMPL_H_
 
 #include "base/files/file_path.h"
 #include "base/macros.h"
 #include "components/filesystem/public/interfaces/file_system.mojom.h"
 #include "components/filesystem/shared_temp_dir.h"
 #include "mojo/public/cpp/bindings/interface_request.h"
 
 namespace base {
 class FilePath;
 }
 
 namespace service_manager {
 class Identity;
 }
 
 namespace filesystem {
-class FileSystemApp;
 
 class LockTable;
 
 // The base implementation of FileSystemImpl.
 class FileSystemImpl : public mojom::FileSystem {
  public:
   // |persistent_dir| is the directory served to callers of
   // |OpenPersistentFileSystem().
   FileSystemImpl(const service_manager::Identity& remote_identity,
                  base::FilePath persistent_dir,
@@ skipping 12 matching lines @@
   scoped_refptr<LockTable> lock_table_;
 
   base::FilePath persistent_dir_;
 
   DISALLOW_COPY_AND_ASSIGN(FileSystemImpl);
 };
 
 }  // namespace filesystem
 
 #endif  // COMPONENTS_FILESYSTEM_FILE_SYSTEM_IMPL_H_