Get rid of content::NavigationController in cc file and use "using" instead.

chrome/browser/repost_form_warning_controller.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/repost_form_warning_controller.h"
 
 #if defined(TOOLKIT_USES_GTK)
 #include <gtk/gtk.h>
 #endif
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "content/public/browser/navigation_controller.h"
 #include "content/public/browser/notification_source.h"
 #include "content/public/browser/notification_types.h"
 #include "content/public/browser/web_contents.h"
 #include "grit/generated_resources.h"
 #include "ui/base/l10n/l10n_util.h"
 
+using content::NavigationController;
 using content::WebContents;
 
 RepostFormWarningController::RepostFormWarningController(
     WebContents* web_contents)
     : TabModalConfirmDialogDelegate(web_contents),
       navigation_controller_(&web_contents->GetController()) {
   registrar_.Add(this, content::NOTIFICATION_REPOST_WARNING_SHOWN,
-                 content::Source<content::NavigationController>(
+                 content::Source<NavigationController>(
                     navigation_controller_));
 }
 
 RepostFormWarningController::~RepostFormWarningController() {
 }
 
 string16 RepostFormWarningController::GetTitle() {
   return l10n_util::GetStringUTF16(IDS_HTTP_POST_WARNING_TITLE);
 }
 
@@ skipping 27 matching lines @@
     int type,
     const content::NotificationSource& source,
     const content::NotificationDetails& details) {
   // Close the dialog if we show an additional dialog, to avoid them
   // stacking up.
   if (type == content::NOTIFICATION_REPOST_WARNING_SHOWN)
     Cancel();
   else
     TabModalConfirmDialogDelegate::Observe(type, source, details);
 }