Deprecate CredentialRequestOptions.unmediated in favor mediation enum

third_party/WebKit/LayoutTests/http/tests/credentialmanager/credentialscontainer-get-errors.html

Index: third_party/WebKit/LayoutTests/http/tests/credentialmanager/credentialscontainer-get-errors.html
diff --git a/third_party/WebKit/LayoutTests/http/tests/credentialmanager/credentialscontainer-get-errors.html b/third_party/WebKit/LayoutTests/http/tests/credentialmanager/credentialscontainer-get-errors.html
index 347fc413fa6d90d72063b970e1a654354afa5276..0acb45c4ed1f3643c93efb3bd4d4b3c01b32e8b3 100644
--- a/third_party/WebKit/LayoutTests/http/tests/credentialmanager/credentialscontainer-get-errors.html
+++ b/third_party/WebKit/LayoutTests/http/tests/credentialmanager/credentialscontainer-get-errors.html
@@ -25,4 +25,15 @@ promise_test(function (t) {
         testRunner.setMockCredentialManagerError("unknown");
     return promise_rejects(t, "NotReadableError", navigator.credentials.get({ password: true }));
 });
+promise_test(function (t) {
+    return promise_rejects(t, new TypeError(), navigator.credentials.get({
+        mediation: "invalid"
+    }));
+});
+promise_test(function (t) {
+    return promise_rejects(t, "NotSupportedError", navigator.credentials.get({
+        unmediated: true,
+        mediation: "required"
+    }));
+});
 </script>