Autofill browser_tests: set autofilled property after autofilled value is set.

R=isherman@chromium.org
BUG=412311

Review URL: https://codereview.chromium.org/605683002

Cr-Commit-Position: refs/heads/master@{#297020}

chrome/renderer/autofill/form_autofill_browsertest.cc

@@ -3194,14 +3194,12 @@ TEST_F(FormAutofillTest, ClearFormWithNodeContainingSelectOne) {
   WebInputElement lastname =
       web_frame->document().getElementById("lastname").to<WebInputElement>();
   lastname.setAutofilled(true);
-  WebInputElement state =
-      web_frame->document().getElementById("state").to<WebInputElement>();
-  state.setAutofilled(true);
 
-  // Set the value of the select-one.
-  WebSelectElement select_element =
+  // Set the value and auto-filled attribute of the state element.
+  WebSelectElement state =
       web_frame->document().getElementById("state").to<WebSelectElement>();
-  select_element.setValue(WebString::fromUTF8("AK"));
+  state.setValue(WebString::fromUTF8("AK"));
+  state.setAutofilled(true);
 
   // Clear the form.
   EXPECT_TRUE(form_cache.ClearFormWithElement(firstname));