ran security updates on contrib modules

ctools, video_embed_field, migrate, views_bulk_operations

sites/all/modules/contrib/dev/ctools/includes/css.inc

@@ -172,10 +172,12 @@ function ctools_css_cache($css, $filter = TRUE) {
   // @todo Is this slow? Does it matter if it is?
   $filename = $path . '/' . md5($css) . '.css';
 
-  // This will do renames if the file already exists, ensuring we don't
-  // accidentally overwrite other files who share the same md5. Yes this
-  // is a very miniscule chance but it's safe.
-  $filename = file_unmanaged_save_data($css, $filename);
+  // Generally md5 is considered unique enough to sign file downloads.
+  // So this replaces already existing files based on the assumption that two
+  // files with the same hash are identical content wise.
+  // If we rename, the cache folder can potentially fill up with thousands of
+  // files with the same content.
+  $filename = file_unmanaged_save_data($css, $filename, FILE_EXISTS_REPLACE);
 
   return $filename;
 }