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 53e2f5a0bbc19fb9284ab825d3dc1c058483a210..78e91de7416d46e236924e255a997cbcdc7fcbd4 100644
--- a/chrome/browser/guestview/webview/webview_guest.h
+++ b/chrome/browser/guestview/webview/webview_guest.h
@@ -31,25 +31,21 @@ class WebviewFindFunction;
 // a particular embedder WebContents. This happens on either initial navigation
 // or through the use of the New Window API, when a new window is attached to
 // a particular <webview>.
-class WebViewGuest : public GuestView,
+class WebViewGuest : public GuestView<WebViewGuest>,
                      public content::NotificationObserver,
                      public content::WebContentsObserver {
  public:
   WebViewGuest(content::WebContents* guest_web_contents,
                const std::string& embedder_extension_id);
 
-  static WebViewGuest* From(int embedder_process_id, int instance_id);
-  static WebViewGuest* FromWebContents(content::WebContents* contents);
   // Returns guestview::kInstanceIDNone if |contents| does not correspond to a
   // WebViewGuest.
   static int GetViewInstanceId(content::WebContents* contents);
+  static const std::string& Type;
 
-  // GuestView implementation.
+  // GuestViewBase 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,