Add delay to didAssociateFormControlsTimer so it doesn't fire too frequently

chrome/renderer/autofill/autofill_renderer_browsertest.cc

Index: chrome/renderer/autofill/autofill_renderer_browsertest.cc
diff --git a/chrome/renderer/autofill/autofill_renderer_browsertest.cc b/chrome/renderer/autofill/autofill_renderer_browsertest.cc
index 5f7ff8cd0d763cf5cb23bb15150858aee387470f..efec7c7b7453f0a370a7f3bd38bc6665370c3f6f 100644
--- a/chrome/renderer/autofill/autofill_renderer_browsertest.cc
+++ b/chrome/renderer/autofill/autofill_renderer_browsertest.cc
@@ -133,8 +133,8 @@ TEST_F(AutofillRendererTest, SendForms) {
       "newForm.appendChild(newLastname);"
       "newForm.appendChild(newEmail);"
       "document.body.appendChild(newForm);");
-  msg_loop_.RunUntilIdle();
 
+  WaitForAutofillDidAssociateFormControl();
   message = render_thread_->sink().GetFirstMessageMatching(
       AutofillHostMsg_FormsSeen::ID);
   ASSERT_NE(nullptr, message);
@@ -211,8 +211,8 @@ TEST_F(AutofillRendererTest, DynamicallyAddedUnownedFormElements) {
   render_thread_->sink().ClearMessages();
 
   ExecuteJavaScriptForTests("AddFields()");
-  msg_loop_.RunUntilIdle();
 
+  WaitForAutofillDidAssociateFormControl();
   message = render_thread_->sink().GetFirstMessageMatching(
       AutofillHostMsg_FormsSeen::ID);
   ASSERT_NE(nullptr, message);