Refactor GuestView.

chrome/browser/guestview/adview/adview_guest.cc

Index: chrome/browser/guestview/adview/adview_guest.cc
diff --git a/chrome/browser/guestview/adview/adview_guest.cc b/chrome/browser/guestview/adview/adview_guest.cc
index 6b0de6fbca74d5e556d2d2ccca5982b2566817c3..3c2cfc89084f35618d46f08c628be84a0e6f587b 100644
--- a/chrome/browser/guestview/adview/adview_guest.cc
+++ b/chrome/browser/guestview/adview/adview_guest.cc
@@ -24,20 +24,13 @@ AdViewGuest* AdViewGuest::From(int embedder_process_id,
   GuestView* guest = GuestView::From(embedder_process_id, guest_instance_id);
   if (!guest)
     return NULL;
-  return guest->AsAdView();
+  return guest->As<AdViewGuest>();
 }
 
-GuestView::Type AdViewGuest::GetViewType() const {
-  return GuestView::ADVIEW;
-}
-
-WebViewGuest* AdViewGuest::AsWebView() {
-  return NULL;
-}
+// static
+GuestView::Type AdViewGuest::Type() { return GuestView::ADVIEW; }
 
-AdViewGuest* AdViewGuest::AsAdView() {
-  return this;
-}
+GuestView::Type AdViewGuest::GetViewType() const { return Type(); }
 
 AdViewGuest::~AdViewGuest() {
 }