In CreateFolder, delete code to recursively create parent directories.

webrtc/rtc_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.
  */
 
 #ifndef WEBRTC_RTC_BASE_UNIXFILESYSTEM_H_
 #define WEBRTC_RTC_BASE_UNIXFILESYSTEM_H_
 
 #include <sys/types.h>
 
 #include "webrtc/rtc_base/fileutils.h"
 
 namespace rtc {
 
 class UnixFilesystem : public FilesystemInterface {
  public:
   UnixFilesystem();
   ~UnixFilesystem() override;
 
   // This will attempt to delete the file located at filename.
   // It will fail with VERIY if you pass it a non-existant file, or a directory.
   bool DeleteFile(const Pathname& filename) override;
 
-  // Creates a directory. This will call itself recursively to create /foo/bar
-  // even if /foo does not exist. All created directories are created with the
-  // given mode.
-  // Returns TRUE if function succeeds
+  // Creates a directory with the given mode. Parent directory must
+  // already exist. Returns TRUE if function succeeds.
   virtual bool CreateFolder(const Pathname &pathname, mode_t mode);
 
   // As above, with mode = 0755.
   bool CreateFolder(const Pathname& pathname) override;
 
   // This moves a file from old_path to new_path, where "file" can be a plain
   // file or directory, which will be moved recursively.
   // Returns true if function succeeds.
   bool MoveFile(const Pathname& old_path, const Pathname& new_path) override;
 
@@ skipping 19 matching lines @@
 #else
   static char* app_temp_path_;
 #endif
 
   static char* CopyString(const std::string& str);
 };
 
 }  // namespace rtc
 
 #endif  // WEBRTC_RTC_BASE_UNIXFILESYSTEM_H_