Allow PasswordCredential instantiation when an input element has multiple 'autocomplete' tokens.

third_party/WebKit/LayoutTests/http/tests/credentialmanager/passwordcredential-basics.html

Index: third_party/WebKit/LayoutTests/http/tests/credentialmanager/passwordcredential-basics.html
diff --git a/third_party/WebKit/LayoutTests/http/tests/credentialmanager/passwordcredential-basics.html b/third_party/WebKit/LayoutTests/http/tests/credentialmanager/passwordcredential-basics.html
index be246a1e11a2ab5d05efa39ea44a5da94f7a10ce..3114c5eeb76b0bda114ace6d845aec7ad58553e7 100644
--- a/third_party/WebKit/LayoutTests/http/tests/credentialmanager/passwordcredential-basics.html
+++ b/third_party/WebKit/LayoutTests/http/tests/credentialmanager/passwordcredential-basics.html
@@ -182,4 +182,17 @@ test(_ => {
     assert_true(credential.additionalData instanceof URLSearchParams);
     verify_form_credential(f, credential);
 }, 'PasswordCredential creation from `HTMLFormElement` with no enctype');
+
+test(_ => {
+    var f = document.createElement('form');
+    f.innerHTML = "<input type='text' name='theId' value='musterman' autocomplete='email username'>"
+        + "<input type='text' name='thePassword' value='sekrit' autocomplete='current-password value1'>"
+        + "<input type='text' name='theIcon' value='https://example.com/photo' autocomplete='photo value2'>"
+        + "<input type='text' name='theExtraField' value='extra'>"
+        + "<input type='text' name='theName' value='friendly name' autocomplete='name value3'>";
+
+    var credential = new PasswordCredential(f);
+    assert_true(credential.additionalData instanceof URLSearchParams);
+    verify_form_credential(f, credential);
+}, 'PasswordCredential creation from `HTMLFormElement` with multiple autocomplete attributes');
 </script>