In CreateFolder, delete code to recursively create parent directories.

webrtc/rtc_base/fileutils.h

Index: webrtc/rtc_base/fileutils.h
diff --git a/webrtc/rtc_base/fileutils.h b/webrtc/rtc_base/fileutils.h
index a4a94727aa4b914ee8793e3a273c43d7a19e1f79..a2a2e690a83ad974814210ea5625fd3052a4e631 100644
--- a/webrtc/rtc_base/fileutils.h
+++ b/webrtc/rtc_base/fileutils.h
@@ -83,8 +83,8 @@ class FilesystemInterface {
   // non-existent file.
   virtual bool DeleteFile(const Pathname &filename) = 0;
 
-  // Creates a directory. This will call itself recursively to create /foo/bar
-  // even if /foo does not exist. Returns true if the function succeeds.
+  // Creates a directory. Parent directory must already exist. Returns
+  // true if the function succeeds.
   virtual bool CreateFolder(const Pathname &pathname) = 0;
 
   // This moves a file from old_path to new_path, where "old_path" is a