Refactor GuestView.

chrome/browser/guestview/webview/webview_guest.h

Index: chrome/browser/guestview/webview/webview_guest.h
diff --git a/chrome/browser/guestview/webview/webview_guest.h b/chrome/browser/guestview/webview/webview_guest.h
index 02345508304b82eee9c2c9597f1c7fffab895dae..8ecc5fc687ca8057960465877de6aff1c9ff09d6 100644
--- a/chrome/browser/guestview/webview/webview_guest.h
+++ b/chrome/browser/guestview/webview/webview_guest.h
@@ -41,13 +41,12 @@ class WebViewGuest : public GuestView,
   // Returns guestview::kInstanceIDNone if |contents| does not correspond to a
   // WebViewGuest.
   static int GetViewInstanceId(content::WebContents* contents);
+  static GuestView::Type Type();
 
   // GuestView implementation.
   virtual void Attach(content::WebContents* embedder_web_contents,
                       const base::DictionaryValue& args) OVERRIDE;
   virtual GuestView::Type GetViewType() const OVERRIDE;
-  virtual WebViewGuest* AsWebView() OVERRIDE;
-  virtual AdViewGuest* AsAdView() OVERRIDE;
 
   // GuestDelegate implementation.
   virtual void AddMessageToConsole(int32 level,