removed obsolete code

Former-commit-id: f93b9bb211bcfe35c58d2952e69279c1a6d39b0c

lib/single-file/single-file-core.js

@@ -1417,13 +1417,6 @@ this.singlefile.lib.core = this.singlefile.lib.core || (() => {
 						}
 						stylesheetContent = stylesheetContent.replace(Util.getRegExp(urlFunction), newUrlFunction);
 					}
-				} else {
-					if (resourceURL.startsWith(DATA_URI_PREFIX)) {
-						const escapedResourceURL = resourceURL.replace(REGEXP_AMP, "&").replace(REGEXP_NBSP, " ").replace(REGEXP_START_TAG, "<").replace(REGEXP_END_TAG, ">");
-						if (escapedResourceURL != resourceURL && stylesheetContent.includes(urlFunction)) {
-							stylesheetContent = stylesheetContent.replace(Util.getRegExp(urlFunction), urlFunction.replace(originalResourceURL, escapedResourceURL));
-						}
-					}
 				}
 			});
 			return stylesheetContent;