Delete Filesystem::CreateFolder.

webrtc/rtc_base/unixfilesystem.h

Index: webrtc/rtc_base/unixfilesystem.h
diff --git a/webrtc/rtc_base/unixfilesystem.h b/webrtc/rtc_base/unixfilesystem.h
index 3c157cb17142e0607e1a30d0577217df45d15264..116df2101c1248298b2b1dffd26ff43a0e58353e 100644
--- a/webrtc/rtc_base/unixfilesystem.h
+++ b/webrtc/rtc_base/unixfilesystem.h
@@ -26,15 +26,6 @@ class UnixFilesystem : public FilesystemInterface {
   // 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
-  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.