Loosen permission on extension temp dir when a flag is used.

base/scoped_temp_dir.h

Index: base/scoped_temp_dir.h
diff --git a/base/scoped_temp_dir.h b/base/scoped_temp_dir.h
index a5dca1e01a04d4eb68bbe5927a4a6ca73a5de89b..a0708dc3eff525254c5be16b5766b8f2a17920cf 100644
--- a/base/scoped_temp_dir.h
+++ b/base/scoped_temp_dir.h
@@ -26,7 +26,8 @@ class ScopedTempDir {
   bool CreateUniqueTempDir();
 
   // Creates a unique directory under a given path, and takes ownership of it.
-  bool CreateUniqueTempDirUnderPath(const FilePath& path);
+  bool CreateUniqueTempDirUnderPath(const FilePath& path,
+                                    bool loose_permissions);
 
   // Takes ownership of directory at |path|, creating it if necessary.
   // Don't call multiple times unless Take() has been called first.