Clean up first run:

chrome/browser/first_run/first_run.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/first_run/first_run.h"
 
 #include "base/command_line.h"
 #include "base/compiler_specific.h"
 #include "base/file_util.h"
 #include "base/path_service.h"
@@ skipping 108 matching lines @@
     return false;
   }
   scoped_refptr<ImporterHost> importer_host(new ImporterHost);
   importer_host->set_headless();
 
   importer::SourceProfile source_profile;
   source_profile.importer_type = importer::TYPE_BOOKMARKS_FILE;
   source_profile.source_path = file_path;
 
   FirstRunImportObserver importer_observer;
-  importer::ShowImportProgressDialog(NULL,
-                                     importer::FAVORITES,
+  importer::ShowImportProgressDialog(importer::FAVORITES,
                                      importer_host,
                                      &importer_observer,
                                      source_profile,
                                      profile,
                                      true);
 
   importer_observer.RunLoop();
   return importer_observer.import_result();
 }
 
@@ skipping 376 matching lines @@
 
   // Reset the preference and notifications to avoid showing the bubble again.
   prefs->SetBoolean(prefs::kShouldShowFirstRunBubble, false);
 
   // Show the bubble now and destroy this bubble launcher.
   browser->ShowFirstRunBubble();
   delete this;
 }
 
 }  // namespace first_run