Bug 1504119 [wpt PR 13854] - location.pathname should return "blank" when there is no browsing con…, a=testonly

Automatic update from web-platform-testslocation.pathname should return "blank" when there is no browsing context (#13854)

The pathname of "about:blank" is "blank", not "".
--

wpt-commits: a6322a0bf9f7b0553dec4c8eee5a673fccf9a91b
wpt-pr: 13854

testing/web-platform/tests/html/browsers/history/the-location-interface/no-browsing-context.window.js

@@ -42,7 +42,7 @@ function bcLessLocation() {
   },
   {
     "property": "pathname",
-    "expected": "",
+    "expected": "blank",
     "values": ["/", "x"]
   },
   {