Refactor GuestView construction

chrome/browser/guest_view/guest_view.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_GUEST_VIEW_GUEST_VIEW_H_
 #define CHROME_BROWSER_GUEST_VIEW_GUEST_VIEW_H_
 
+#include "base/bind.h"
 #include "chrome/browser/guest_view/guest_view_base.h"
 #include "content/public/browser/render_frame_host.h"
 
 // A GuestView is the templated base class for out-of-process frames in the
 // chrome layer. GuestView is templated on its derived type to allow for type-
 // safe access. See GuestViewBase for more information.
 template <typename T>
 class GuestView : public GuestViewBase {
  public:
+  static void Register() {
+    GuestViewBase::RegisterGuestViewType(T::Type, base::Bind(&T::Create));
+  }
+
   static T* From(int embedder_process_id, int guest_instance_id) {
     GuestViewBase* guest =
         GuestViewBase::From(embedder_process_id, guest_instance_id);
     if (!guest)
       return NULL;
     return guest->As<T>();
   }
 
   static T* FromWebContents(content::WebContents* contents) {
     GuestViewBase* guest = GuestViewBase::FromWebContents(contents);
@@ skipping 31 matching lines @@
   GuestView(content::BrowserContext* browser_context,
             int guest_instance_id)
       : GuestViewBase(browser_context, guest_instance_id) {}
   virtual ~GuestView() {}
 
  private:
   DISALLOW_COPY_AND_ASSIGN(GuestView);
 };
 
 #endif  // CHROME_BROWSER_GUEST_VIEW_GUEST_VIEW_H_