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

extensions/browser/guest_view/web_view/web_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 EXTENSIONS_BROWSER_GUEST_VIEW_WEB_VIEW_WEB_VIEW_GUEST_H_
 #define EXTENSIONS_BROWSER_GUEST_VIEW_WEB_VIEW_WEB_VIEW_GUEST_H_
 
 #include <vector>
 
 #include "base/observer_list.h"
@@ skipping 73 matching lines @@
   // Sets the transparency of the guest.
   void SetAllowTransparency(bool allow);
 
   // Loads a data URL with a specified base URL and virtual URL.
   bool LoadDataWithBaseURL(const std::string& data_url,
                            const std::string& base_url,
                            const std::string& virtual_url,
                            std::string* error);
 
   // GuestViewBase implementation.
-  const char* GetAPINamespace() const override;
-  int GetTaskPrefix() const override;
+  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;
   void EmbedderWillBeDestroyed() override;
+  const char* GetAPINamespace() const override;
+  int GetTaskPrefix() const override;
   void GuestDestroyed() override;
   void GuestReady() override;
   void GuestSizeChangedDueToAutoSize(const gfx::Size& old_size,
                                      const gfx::Size& new_size) override;
   bool IsAutoSizeSupported() const override;
   bool IsDragAndDropEnabled() const override;
   void WillAttachToEmbedder() override;
   void WillDestroy() override;
 
   // WebContentsDelegate implementation.
@@ skipping 43 matching lines @@
   content::WebContents* OpenURLFromTab(
       content::WebContents* source,
       const content::OpenURLParams& params) override;
   void WebContentsCreated(content::WebContents* source_contents,
                           int opener_render_frame_id,
                           const base::string16& frame_name,
                           const GURL& target_url,
                           content::WebContents* new_contents) override;
 
   // BrowserPluginGuestDelegate implementation.
-  bool CanRunInDetachedState() const override;
   content::WebContents* CreateNewGuestWindow(
       const content::WebContents::CreateParams& create_params) override;
   void RequestPointerLockPermission(
       bool user_gesture,
       bool last_unlocked_by_target,
       const base::Callback<void(bool)>& callback) override;
+
   // NotificationObserver implementation.
   void Observe(int type,
                const content::NotificationSource& source,
                const content::NotificationDetails& details) override;
 
   // Returns the current zoom factor.
   double zoom() const { return current_zoom_factor_; }
 
   // Begin or continue a find request.
   void StartFinding(const base::string16& search_text,
@@ skipping 193 matching lines @@
   // This is used to ensure pending tasks will not fire after this object is
   // destroyed.
   base::WeakPtrFactory<WebViewGuest> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(WebViewGuest);
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_BROWSER_GUEST_VIEW_WEB_VIEW_WEB_VIEW_GUEST_H_