Delete unused method Win32Filesystem::GetAppPathname.

webrtc/base/win32filesystem.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 42 matching lines @@
   bool GetFileSize(const Pathname& path, size_t* size) override;
   bool GetFileTime(const Pathname& path,
                    FileTimeType which,
                    time_t* time) override;
 
   // A folder appropriate for storing temporary files (Contents are
   // automatically deleted when the program exists)
   bool GetTemporaryFolder(Pathname& path,
                           bool create,
                           const std::string* append) override;
-
- private:
-  // Returns the path to the running application.
-  bool GetAppPathname(Pathname* path);
 };
 
 }  // namespace rtc
 
 #endif  // WEBRTC_WINFILESYSTEM_H__