Delete Filesystem::CreateFolder.

webrtc/rtc_base/win32filesystem.h

Index: webrtc/rtc_base/win32filesystem.h
diff --git a/webrtc/rtc_base/win32filesystem.h b/webrtc/rtc_base/win32filesystem.h
index 0fff15dfe0071c1a5d296177203791336624a9af..95c820ca726a2392be487af42ac30d943b4e53f6 100644
--- a/webrtc/rtc_base/win32filesystem.h
+++ b/webrtc/rtc_base/win32filesystem.h
@@ -21,11 +21,6 @@ class Win32Filesystem : public FilesystemInterface {
   // If the path points to a folder, it will fail with VERIFY
   bool DeleteFile(const Pathname& filename) override;
 
-  // Creates a directory. This will call itself recursively to create /foo/bar even if
-  // /foo does not exist.
-  // Returns TRUE if function succeeds
-  bool CreateFolder(const Pathname& pathname) override;
-
   // This moves a file from old_path to new_path. If the new path is on a
   // different volume than the old, it will attempt to copy and then delete
   // the folder