Refactor guest view availability to be API not permission based.

chrome/browser/guest_view/extension_options/extension_options_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_EXTENSION_OPTIONS_EXTENSION_OPTIONS_GUEST_H_
 #define CHROME_BROWSER_GUEST_VIEW_EXTENSION_OPTIONS_EXTENSION_OPTIONS_GUEST_H_
 
 #include "base/macros.h"
 #include "chrome/browser/guest_view/guest_view.h"
 #include "extensions/browser/extension_function_dispatcher.h"
 #include "url/gurl.h"
 
 namespace content {
 class BrowserContext;
 }
 
 class ExtensionOptionsGuest
     : public GuestView<ExtensionOptionsGuest>,
       public extensions::ExtensionFunctionDispatcher::Delegate {
  public:
   static const char Type[];
   static GuestViewBase* Create(content::BrowserContext* browser_context,
                                int guest_instance_id);
 
   // 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;
   virtual void DidStopLoading() OVERRIDE;
   virtual void GuestSizeChangedDueToAutoSize(
       const gfx::Size& old_size,
@@ skipping 14 matching lines @@
   void OnRequest(const ExtensionHostMsg_Request_Params& params);
 
   scoped_ptr<extensions::ExtensionFunctionDispatcher>
       extension_function_dispatcher_;
   GURL options_page_;
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionOptionsGuest);
 };
 
 #endif  // CHROME_BROWSER_GUEST_VIEW_EXTENSION_OPTIONS_EXTENSION_OPTIONS_GUEST_H_