Fixing the bug, that caused UI to hang after unsupported device was inserted.

chrome/browser/notifications/notification_ui_manager.cc

 // Copyright (c) 2011 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/notifications/notification_ui_manager.h"
 
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/stl_util.h"
 #include "chrome/browser/browser_process.h"
@@ skipping 134 matching lines @@
 }
 
 void NotificationUIManager::CheckAndShowNotifications() {
   CheckUserState();
   if (is_user_active_)
     ShowNotifications();
 }
 
 void NotificationUIManager::CheckUserState() {
   bool is_user_active_previously = is_user_active_;
-  is_user_active_ = CalculateIdleStateSync(0) != IDLE_STATE_LOCKED &&
-                    !IsFullScreenMode();
+  is_user_active_ = !CheckIdleStateIsLocked() && !IsFullScreenMode();
   if (is_user_active_ == is_user_active_previously)
     return;
 
   if (is_user_active_) {
     user_state_check_timer_.Stop();
     // We need to show any postponed nofications when the user becomes active
     // again.
     ShowNotifications();
   } else if (!user_state_check_timer_.IsRunning()) {
     // Start a timer to detect the moment at which the user becomes active.
@@ skipping 73 matching lines @@
   } else if (type == chrome::NOTIFICATION_PREF_CHANGED) {
     std::string* name = Details<std::string>(details).ptr();
     if (*name == prefs::kDesktopNotificationPosition)
       balloon_collection_->SetPositionPreference(
           static_cast<BalloonCollection::PositionPreference>(
               position_pref_.GetValue()));
   } else {
     NOTREACHED();
   }
 }