Use AutofillDriver* in ContentAutofillDriverFactory when possible

chrome/browser/ui/autofill/chrome_autofill_client.cc

Index: chrome/browser/ui/autofill/chrome_autofill_client.cc
diff --git a/chrome/browser/ui/autofill/chrome_autofill_client.cc b/chrome/browser/ui/autofill/chrome_autofill_client.cc
index 773ee6b7ae5af0e0080021b8e1f8462f26e497a1..31374796dbecf32216f56889f2ba1e5bb03818bd 100644
--- a/chrome/browser/ui/autofill/chrome_autofill_client.cc
+++ b/chrome/browser/ui/autofill/chrome_autofill_client.cc
@@ -348,7 +348,8 @@ void ChromeAutofillClient::OnFirstUserGestureObserved() {
     // And actually they have no corresponding drivers in the factory's map.
     if (!frame->IsRenderFrameLive())
       continue;
-    ContentAutofillDriver* driver = factory->DriverForFrame(frame);
+    ContentAutofillDriver* driver =
+        static_cast<ContentAutofillDriver*>(factory->DriverForFrame(frame));
     DCHECK(driver);
     driver->NotifyFirstUserGestureObservedInTab();
   }