Refactor GuestView.

chrome/browser/guestview/adview/adview_guest.h

Index: chrome/browser/guestview/adview/adview_guest.h
diff --git a/chrome/browser/guestview/adview/adview_guest.h b/chrome/browser/guestview/adview/adview_guest.h
index aaefe00e3644e169025c63f031e977dd3cdd695f..2d0343df5462d639a691021415f9b02b475f3ab3 100644
--- a/chrome/browser/guestview/adview/adview_guest.h
+++ b/chrome/browser/guestview/adview/adview_guest.h
@@ -16,18 +16,13 @@
 // a particular embedder WebContents, we call this "attachment".
 // TODO(fsamuel): There might be an opportunity here to refactor and reuse code
 // between AdViewGuest and WebViewGuest.
-class AdViewGuest : public GuestView,
+class AdViewGuest : public GuestView<AdViewGuest>,
                     public content::WebContentsObserver {
  public:
   AdViewGuest(content::WebContents* guest_web_contents,
               const std::string& extension_id);
 
-  static AdViewGuest* From(int embedder_process_id, int instance_id);
-
-  // GuestView implementation.
-  virtual GuestView::Type GetViewType() const OVERRIDE;
-  virtual WebViewGuest* AsWebView() OVERRIDE;
-  virtual AdViewGuest* AsAdView() OVERRIDE;
+  static const std::string& Type;
 
  private:
   virtual ~AdViewGuest();