Export a private webstore API to call into the new inline sign-in flow.

chrome/browser/invalidation/profile_invalidation_auth_provider.cc

 // 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.
 
 #include "chrome/browser/invalidation/profile_invalidation_auth_provider.h"
 
 #include "chrome/browser/ui/webui/signin/login_ui_service.h"
 #include "components/signin/core/browser/profile_oauth2_token_service.h"
 
 namespace invalidation {
 
 ProfileInvalidationAuthProvider::ProfileInvalidationAuthProvider(
     SigninManagerBase* signin_manager,
     ProfileOAuth2TokenService* token_service,
     LoginUIService* login_ui_service)
     : signin_manager_(signin_manager),
       token_service_(token_service),
       login_ui_service_(login_ui_service) {
   signin_manager_->AddObserver(this);
+  SigninManagerFactory::GetInstance()->AddObserver(this);
 }
 
 ProfileInvalidationAuthProvider::~ProfileInvalidationAuthProvider() {
-  signin_manager_->RemoveObserver(this);
+  SigninManagerFactory::GetInstance()->RemoveObserver(this);
+  if (signin_manager_)
+    signin_manager_->RemoveObserver(this);
 }
 
 std::string ProfileInvalidationAuthProvider::GetAccountId() {
   return signin_manager_->GetAuthenticatedAccountId();
 }
 
 OAuth2TokenService* ProfileInvalidationAuthProvider::GetTokenService() {
   return token_service_;
 }
 
 bool ProfileInvalidationAuthProvider::ShowLoginUI() {
   login_ui_service_->ShowLoginPopup();
   return true;
 }
 
 void ProfileInvalidationAuthProvider::GoogleSignedOut(
     const std::string& username) {
   FireInvalidationAuthLogout();
 }
 
+void ProfileInvalidationAuthProvider::SigninManagerShutdown(
+    SigninManagerBase* manager) {
+  if (manager == signin_manager_) {
+    signin_manager_->RemoveObserver(this);
+    signin_manager_ = NULL;
+  }
+}
+
 }  // namespace invalidation