Implement signin using webview

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 76 matching lines @@
   const char* GetAPINamespace() const override;
   int GetTaskPrefix() const override;
   void CreateWebContents(const std::string& embedder_extension_id,
                          int embedder_render_process_id,
                          const GURL& embedder_site_url,
                          const base::DictionaryValue& create_params,
                          const WebContentsCreatedCallback& callback) override;
   void DidAttachToEmbedder() override;
   void DidInitialize() override;
   void DidStopLoading() override;
+  void WillDetachFromEmbedder() override;
   void EmbedderDestroyed() 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;
 
@@ skipping 258 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_