[Autofill] Update tests to support native UI

chrome/renderer/autofill/form_autofill_util.cc

Index: chrome/renderer/autofill/form_autofill_util.cc
diff --git a/chrome/renderer/autofill/form_autofill_util.cc b/chrome/renderer/autofill/form_autofill_util.cc
index 5af22925310899e097ef17cafdba292a9c25472d..f120c31514e637ac5f4ba732287d19f186055025 100644
--- a/chrome/renderer/autofill/form_autofill_util.cc
+++ b/chrome/renderer/autofill/form_autofill_util.cc
@@ -467,12 +467,9 @@ void ForEachMatchingFormField(const WebFormElement& form_element,
                               &control_elements);
 
   if (control_elements.size() != data.fields.size()) {
-    // This case should be reachable only for pathological websites, which add
-    // or remove form fields while the user is interacting with the Autofill
-    // popup.  I (isherman) am not aware of any such websites, and so am
-    // optimistically including a NOTREACHED().  If you ever trip this check,
-    // please file a bug against me.
-    NOTREACHED();
+    // This case should be reachable only for pathological websites and tests,
+    // which add or remove form fields while the user is interacting with the
+    // Autofill popup.
     return;
   }