Delete unused Filesystem methods GetAppDataFolder and GetDiskFreeSpace.

webrtc/base/unixfilesystem.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 76 matching lines @@
   // automatically deleted when the program exists)
   bool GetTemporaryFolder(Pathname& path,
                           bool create,
                           const std::string* append) override;
 
   bool GetFileSize(const Pathname& path, size_t* size) override;
   bool GetFileTime(const Pathname& path,
                    FileTimeType which,
                    time_t* time) override;
 
-  bool GetAppDataFolder(Pathname* path, bool per_user) override;
-
   // Get a temporary folder that is unique to the current user and application.
   bool GetAppTempFolder(Pathname* path) override;
 
-  bool GetDiskFreeSpace(const Pathname& path, int64_t* freebytes) override;
-
  private:
 #if defined(WEBRTC_ANDROID) || defined(WEBRTC_MAC)
   static char* provided_app_data_folder_;
   static char* provided_app_temp_folder_;
 #else
   static char* app_temp_path_;
 #endif
 
   static char* CopyString(const std::string& str);
 };
 
 }  // namespace rtc
 
 #endif  // WEBRTC_BASE_UNIXFILESYSTEM_H_