Bug 1377772 - URL.searchParams should exist also when nsSimpleURI is used, r=smaug

dom/url/URLMainThread.cpp

@@ -325,12 +325,9 @@ URLMainThread::UpdateURLSearchParams()
   }
 
   nsAutoCString search;
-  nsCOMPtr<nsIURL> url(do_QueryInterface(mURI));
-  if (url) {
-    nsresult rv = url->GetQuery(search);
-    if (NS_WARN_IF(NS_FAILED(rv))) {
-      search.Truncate();
-    }
+  nsresult rv = mURI->GetQuery(search);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    search.Truncate();
   }
 
   mSearchParams->ParseInput(search);

dom/url/tests/urlSearchParams_commons.js

@@ -47,8 +47,14 @@ function testURL() {
   url.searchParams.set('e', 'f');
   ok(url.href.indexOf('e=f') != 1, 'URL right');
 
+
+  url = new URL('mailto:a@b.com?subject=Hi');
+  ok(url.searchParams, "URL searchParams exists!");
+  ok(url.searchParams.has('subject'), "Hi");
+
   runTest();
 }
+
 function testParserURLSearchParams() {
   var checks = [
     { input: '', data: {} },