Don't keep file system directories around if they contain unrelated files.

webkit/fileapi/obfuscated_file_util.h

Index: webkit/fileapi/obfuscated_file_util.h
diff --git a/webkit/fileapi/obfuscated_file_util.h b/webkit/fileapi/obfuscated_file_util.h
index 46f62624decf6bb3e9865e13e18257d8cde703c1..0bf67a072698015d45d370d1020d240ba5bcbcce 100644
--- a/webkit/fileapi/obfuscated_file_util.h
+++ b/webkit/fileapi/obfuscated_file_util.h
@@ -139,19 +139,17 @@ class FILEAPI_EXPORT_PRIVATE ObfuscatedFileUtil : public FileSystemFileUtil {
   // Gets the topmost directory specific to this origin and type.  This will
   // contain both the directory database's files and all the backing file
   // subdirectories.
+  // Returns an empty path if the directory is undefined (e.g. because |type|
+  // is invalid). If the directory is defined, it will be returned, even if
+  // there is a file system error (e.g. the directory doesn't exist on disk and
+  // |create| is false). Callers should always check |error_code| to make sure
+  // the returned path is usable.
   FilePath GetDirectoryForOriginAndType(
       const GURL& origin,
       FileSystemType type,
       bool create,
       base::PlatformFileError* error_code);
 
-  FilePath GetDirectoryForOriginAndType(
-      const GURL& origin,
-      FileSystemType type,
-      bool create) {
-    return GetDirectoryForOriginAndType(origin, type, create, NULL);
-  }
-
   // Deletes the topmost directory specific to this origin and type.  This will
   // delete its directory database.
   bool DeleteDirectoryForOriginAndType(const GURL& origin, FileSystemType type);