Implement signin using webview

chrome/browser/guest_view/web_view/chrome_web_view_guest_delegate.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_WEB_VIEW_CHROME_WEB_VIEW_GUEST_DELEGATE_H_
 #define CHROME_BROWSER_GUEST_VIEW_WEB_VIEW_CHROME_WEB_VIEW_GUEST_DELEGATE_H_
 
 #include "chrome/browser/extensions/api/web_view/chrome_web_view_internal_api.h"
 #include "chrome/browser/ui/zoom/zoom_observer.h"
 #include "extensions/browser/guest_view/web_view/web_view_guest.h"
@@ skipping 19 matching lines @@
   // WebViewGuestDelegate implementation.
   double GetZoom() override;
   bool HandleContextMenu(const content::ContextMenuParams& params) override;
   void OnAttachWebViewHelpers(content::WebContents* contents) override;
   void OnDidAttachToEmbedder() override;
   void OnDidCommitProvisionalLoadForFrame(bool is_main_frame) override;
   void OnDidInitialize() override;
   void OnDocumentLoadedInFrame(
       content::RenderFrameHost* render_frame_host) override;
   void OnGuestReady() override;
+  void OnWillDetachFromEmbedder() override;
   void OnGuestDestroyed() override;
   void OnSetZoom(double zoom_factor) override;
   void OnShowContextMenu(int request_id, const MenuItemVector* items) override;
 
   // ZoomObserver implementation.
   void OnZoomChanged(const ZoomController::ZoomChangedEventData& data) override;
 
   extensions::WebViewGuest* web_view_guest() const { return web_view_guest_; }
 
  private:
@@ skipping 37 matching lines @@
 
   // This is used to ensure pending tasks will not fire after this object is
   // destroyed.
   base::WeakPtrFactory<ChromeWebViewGuestDelegate> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ChromeWebViewGuestDelegate);
 };
 
 #endif  // CHROME_BROWSER_GUEST_VIEW_WEB_VIEW_CHROME_WEB_VIEW_GUEST_DELEGATE_H_