<webview>, <appview> and <extensionoptions> can run in a detached state.

extensions/browser/guest_view/extension_options/extension_options_guest.h

Index: extensions/browser/guest_view/extension_options/extension_options_guest.h
diff --git a/extensions/browser/guest_view/extension_options/extension_options_guest.h b/extensions/browser/guest_view/extension_options/extension_options_guest.h
index f62b303f1d2e27e83f158a8375948498c9981d63..4e7bd2085302b82b06fcf69073cdda6a04dc3c29 100644
--- a/extensions/browser/guest_view/extension_options/extension_options_guest.h
+++ b/extensions/browser/guest_view/extension_options/extension_options_guest.h
@@ -28,9 +28,9 @@ class ExtensionOptionsGuest
       int guest_instance_id);
 
   // GuestViewBase implementation.
+  bool CanRunInDetachedState() const override;
   void CreateWebContents(const base::DictionaryValue& create_params,
                          const WebContentsCreatedCallback& callback) override;
-  void DidAttachToEmbedder() override;
   void DidInitialize(const base::DictionaryValue& create_params) override;
   void DidStopLoading() override;
   const char* GetAPINamespace() const override;
@@ -38,8 +38,8 @@ class ExtensionOptionsGuest
   void GuestSizeChangedDueToAutoSize(const gfx::Size& old_size,
                                      const gfx::Size& new_size) override;
   bool IsAutoSizeSupported() const override;
-  void OnPreferredSizeChanged(const gfx::Size& pref_size) override;
   bool IsPreferredSizeModeEnabled() const override;
+  void OnPreferredSizeChanged(const gfx::Size& pref_size) override;
 
   // ExtensionFunctionDispatcher::Delegate implementation.
   content::WebContents* GetAssociatedWebContents() const override;
@@ -78,7 +78,6 @@ class ExtensionOptionsGuest
   scoped_ptr<extensions::ExtensionOptionsGuestDelegate>
       extension_options_guest_delegate_;
   GURL options_page_;
-  bool has_navigated_;
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionOptionsGuest);
 };