Send a notification when the signed-in user is about to sign out.

chrome/browser/signin/signin_manager.cc

 // Copyright (c) 2012 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/signin/signin_manager.h"
 
 #include <string>
 #include <vector>
 
 #include "base/command_line.h"
@@ skipping 348 matching lines @@
     return;
   }
 
   GoogleServiceSignoutDetails details(authenticated_username_);
 
   ClearTransientSigninData();
   authenticated_username_.clear();
   profile_->GetPrefs()->ClearPref(prefs::kGoogleServicesUsername);
   profile_->GetPrefs()->ClearPref(prefs::kIsGooglePlusUser);
   TokenService* token_service = TokenServiceFactory::GetForProfile(profile_);
-  token_service->ResetCredentialsInMemory();
-  token_service->EraseTokensFromDB();
   content::NotificationService::current()->Notify(
       chrome::NOTIFICATION_GOOGLE_SIGNED_OUT,
       content::Source<Profile>(profile_),
       content::Details<const GoogleServiceSignoutDetails>(&details));
+  token_service->ResetCredentialsInMemory();
+  token_service->EraseTokensFromDB();
 }
 
 bool SigninManager::AuthInProgress() const {
   return !possibly_invalid_username_.empty();
 }
 
 void SigninManager::OnGetUserInfoKeyNotFound(const std::string& key) {
   DCHECK(key == kGetInfoEmailKey);
   LOG(ERROR) << "Account is not associated with a valid email address. "
              << "Login failed.";
@@ skipping 155 matching lines @@
 void SigninManager::OnPreferenceChanged(PrefServiceBase* service,
                                         const std::string& pref_name) {
   DCHECK_EQ(std::string(prefs::kGoogleServicesUsernamePattern), pref_name);
   if (!authenticated_username_.empty() &&
       !IsAllowedUsername(authenticated_username_)) {
     // Signed in user is invalid according to the current policy so sign
     // the user out.
     SignOut();
   }
 }