notification balloons: Remove views and cocoa implementations of BalloonCollection.

chrome/browser/notifications/notification_ui_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/notifications/notification_ui_manager.h"
 
 #include "base/memory/scoped_ptr.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/notifications/message_center_notification_manager.h"
 #include "chrome/browser/notifications/message_center_settings_controller.h"
@@ skipping 23 matching lines @@
     ProfileInfoCache* profile_info_cache =
         &g_browser_process->profile_manager()->GetProfileInfoCache();
     scoped_ptr<message_center::NotifierSettingsProvider> settings_provider(
         new MessageCenterSettingsController(profile_info_cache));
     return new MessageCenterNotificationManager(
         g_browser_process->message_center(),
         local_state,
         settings_provider.Pass());
   }
 
-#if defined(OS_CHROMEOS)
-  // Since we can't reach here for CrOS (see above), no point compiling all
-  // the dependent classes there.
-  CHECK(false);
-  return NULL;
-#elif defined(OS_MACOSX) || defined(USE_AURA)
-  // IsRichNotificationEnabled() always returns true in this case.
-  CHECK(false);
-  return NULL;
-#else
+#if defined(TOOLKIT_GTK)
   BalloonNotificationUIManager* balloon_manager =
       new BalloonNotificationUIManager(local_state);
   balloon_manager->SetBalloonCollection(BalloonCollection::Create());
   return balloon_manager;
+#else
+  CHECK(false);
+  return NULL;
 #endif
 }