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

chrome/browser/printing/print_preview_tab_controller.cc

Index: chrome/browser/printing/print_preview_tab_controller.cc
===================================================================
--- chrome/browser/printing/print_preview_tab_controller.cc	(revision 116288)
+++ chrome/browser/printing/print_preview_tab_controller.cc	(working copy)
@@ -40,6 +40,7 @@
 #include "content/public/browser/render_process_host.h"
 #include "webkit/plugins/webplugininfo.h"
 
+using content::NavigationController;
 using content::WebContents;
 using content::WebUIMessageHandler;
 
@@ -222,8 +223,8 @@
       break;
     }
     case content::NOTIFICATION_NAV_ENTRY_COMMITTED: {
-      content::NavigationController* controller =
-          content::Source<content::NavigationController>(source).ptr();
+      NavigationController* controller =
+          content::Source<NavigationController>(source).ptr();
       TabContentsWrapper* wrapper =
           TabContentsWrapper::GetCurrentWrapperForContents(
               controller->GetWebContents());
@@ -416,8 +417,7 @@
                  content::Source<WebContents>(contents));
   registrar_.Add(
       this, content::NOTIFICATION_NAV_ENTRY_COMMITTED,
-      content::Source<content::NavigationController>(
-          &contents->GetController()));
+      content::Source<NavigationController>(&contents->GetController()));
 
   // Multiple sites may share the same RenderProcessHost, so check if this
   // notification has already been added.
@@ -437,8 +437,7 @@
                     content::Source<WebContents>(contents));
   registrar_.Remove(
       this, content::NOTIFICATION_NAV_ENTRY_COMMITTED,
-      content::Source<content::NavigationController>(
-          &contents->GetController()));
+      content::Source<NavigationController>(&contents->GetController()));
 
   // Multiple sites may share the same RenderProcessHost, so check if this
   // notification has already been added.