Delete unused class FilesystemScope.

webrtc/base/fileutils.h

 /*
  *  Copyright 2004 The WebRTC Project Authors. All rights reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 293 matching lines @@
     EnsureDefaultFilesystem()->GetApplicationName(application);
   }
 
  private:
   static FilesystemInterface* default_filesystem_;
 
   static FilesystemInterface *EnsureDefaultFilesystem();
   RTC_DISALLOW_IMPLICIT_CONSTRUCTORS(Filesystem);
 };
 
-class FilesystemScope{
- public:
-  explicit FilesystemScope(FilesystemInterface *new_fs) {
-    old_fs_ = Filesystem::swap_default_filesystem(new_fs);
-  }
-  ~FilesystemScope() {
-    Filesystem::set_default_filesystem(old_fs_);
-  }
- private:
-  FilesystemInterface* old_fs_;
-  RTC_DISALLOW_IMPLICIT_CONSTRUCTORS(FilesystemScope);
-};
-
 }  // namespace rtc
 
 #endif  // WEBRTC_BASE_FILEUTILS_H_