Use AutofillDriver* in ContentAutofillDriverFactory when possible

chrome/browser/autofill/form_structure_browsertest.cc

Index: chrome/browser/autofill/form_structure_browsertest.cc
diff --git a/chrome/browser/autofill/form_structure_browsertest.cc b/chrome/browser/autofill/form_structure_browsertest.cc
index 4a77401161403f5e33acc874517d54383d39a80b..7b1049f7ea89fa43349eb568e28bb0030a0ef54f 100644
--- a/chrome/browser/autofill/form_structure_browsertest.cc
+++ b/chrome/browser/autofill/form_structure_browsertest.cc
@@ -115,9 +115,9 @@ void FormStructureBrowserTest::GenerateResults(const std::string& input,
 
   content::WebContents* web_contents =
       browser()->tab_strip_model()->GetActiveWebContents();
-  ContentAutofillDriver* autofill_driver =
+  ContentAutofillDriver* autofill_driver = static_cast<ContentAutofillDriver*>(
       ContentAutofillDriverFactory::FromWebContents(web_contents)
-          ->DriverForFrame(web_contents->GetMainFrame());
+          ->DriverForFrame(web_contents->GetMainFrame()));
   ASSERT_NE(nullptr, autofill_driver);
   AutofillManager* autofill_manager = autofill_driver->autofill_manager();
   ASSERT_NE(nullptr, autofill_manager);