Bug 1436398 [wpt PR 9416]- Update wpt metadata, a=testonly

wpt-pr: 9416
wpt-type: metadata

testing/web-platform/meta/css/selectors/matches-nested.html.ini

@@ -0,0 +1,7 @@
+[matches-nested.html]
+  [Test nested :matches() chooses highest specificity for class outside :matches().]
+    expected: FAIL
+
+  [Test nested :matches() specificity for class within arguments.]
+    expected: FAIL
+

testing/web-platform/meta/css/selectors/matches-specificity.html.ini

@@ -0,0 +1,4 @@
+[matches-specificity.html]
+  [Test :matches() uses highest possible specificity]
+    expected: FAIL
+