[Password Manager] Check the success of extracting FormData in PasswordForm creation

components/autofill/content/renderer/password_form_conversion_utils_browsertest.cc

Index: components/autofill/content/renderer/password_form_conversion_utils_browsertest.cc
diff --git a/components/autofill/content/renderer/password_form_conversion_utils_browsertest.cc b/components/autofill/content/renderer/password_form_conversion_utils_browsertest.cc
index ead27968a8431033877ad2386288d0e4a16eead7..3a3ac4b51a536bb4745a1e8d7f87a50187f07b1c 100644
--- a/components/autofill/content/renderer/password_form_conversion_utils_browsertest.cc
+++ b/components/autofill/content/renderer/password_form_conversion_utils_browsertest.cc
@@ -1470,4 +1470,13 @@ TEST_F(MAYBE_PasswordFormConversionUtilsTest,
   EXPECT_FALSE(password_form->does_look_like_signup_form);
 }
 
+TEST_F(MAYBE_PasswordFormConversionUtilsTest, TooManyFieldsToParseForm) {
+  PasswordFormBuilder builder(kTestFormActionURL);
+  for (size_t i = 0; i < form_util::kMaxParseableFields + 1; ++i)
+    builder.AddTextField("id", "value", "autocomplete");
+  std::unique_ptr<PasswordForm> password_form =
+      LoadHTMLAndConvertForm(builder.ProduceHTML(), nullptr, false);
+  EXPECT_FALSE(password_form);
+}
+
 }  // namespace autofill