Refactor guest view availability to be API not permission based.

chrome/browser/guest_view/app_view/app_view_guest.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_APP_VIEW_APP_VIEW_GUEST_H_
 #define CHROME_BROWSER_GUEST_VIEW_APP_VIEW_APP_VIEW_GUEST_H_
 
 #include "base/id_map.h"
 #include "chrome/browser/guest_view/guest_view.h"
 #include "extensions/browser/extension_function_dispatcher.h"
@@ skipping 29 matching lines @@
   virtual content::WebContents* GetAssociatedWebContents() const OVERRIDE;
 
   // content::WebContentsObserver implementation.
   virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
 
   // content::WebContentsDelegate implementation.
   virtual bool HandleContextMenu(
       const content::ContextMenuParams& params) OVERRIDE;
 
   // GuestViewBase implementation.
-  virtual bool CanEmbedderUseGuestView(
-      const std::string& embedder_extension_id) OVERRIDE;
+  virtual const char* GetAPINamespace() OVERRIDE;
   virtual void CreateWebContents(
       const std::string& embedder_extension_id,
       int embedder_render_process_id,
       const base::DictionaryValue& create_params,
       const WebContentsCreatedCallback& callback) OVERRIDE;
   virtual void DidAttachToEmbedder() OVERRIDE;
   virtual void DidInitialize() OVERRIDE;
 
  private:
   AppViewGuest(content::BrowserContext* browser_context,
@@ skipping 16 matching lines @@
       extension_function_dispatcher_;
 
   // This is used to ensure pending tasks will not fire after this object is
   // destroyed.
   base::WeakPtrFactory<AppViewGuest> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(AppViewGuest);
 };
 
 #endif  // CHROME_BROWSER_GUEST_VIEW_APP_VIEW_APP_VIEW_GUEST_H_