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

chrome/browser/instant/instant_loader.cc

Index: chrome/browser/instant/instant_loader.cc
===================================================================
--- chrome/browser/instant/instant_loader.cc	(revision 116288)
+++ chrome/browser/instant/instant_loader.cc	(working copy)
@@ -52,6 +52,7 @@
 #include "ui/base/l10n/l10n_util.h"
 #include "ui/gfx/codec/png_codec.h"
 
+using content::NavigationController;
 using content::NavigationEntry;
 using content::WebContents;
 
@@ -296,7 +297,7 @@
   registrar_.Add(this, content::NOTIFICATION_INTERSTITIAL_ATTACHED,
       content::Source<WebContents>(loader->preview_contents()->web_contents()));
   registrar_.Add(this, content::NOTIFICATION_FAIL_PROVISIONAL_LOAD_WITH_ERROR,
-      content::Source<content::NavigationController>(
+      content::Source<NavigationController>(
           &loader->preview_contents()->web_contents()->GetController()));
 }
 
@@ -779,7 +780,7 @@
       registrar_.Remove(
           this,
           content::NOTIFICATION_RENDER_VIEW_HOST_CHANGED,
-          content::Source<content::NavigationController>(
+          content::Source<NavigationController>(
               &preview_contents_->web_contents()->GetController()));
 #endif
     }
@@ -999,13 +1000,13 @@
   registrar_.Remove(
       this,
       content::NOTIFICATION_RENDER_VIEW_HOST_CHANGED,
-      content::Source<content::NavigationController>(
+      content::Source<NavigationController>(
           &old_tc->web_contents()->GetController()));
 #endif
   registrar_.Remove(
       this,
       content::NOTIFICATION_NAV_ENTRY_COMMITTED,
-      content::Source<content::NavigationController>(
+      content::Source<NavigationController>(
           &old_tc->web_contents()->GetController()));
 
   // We prerendered so we should be ready to show. If we're ready, swap in
@@ -1045,14 +1046,14 @@
   registrar_.Add(
       this,
       content::NOTIFICATION_RENDER_VIEW_HOST_CHANGED,
-      content::Source<content::NavigationController>(
+      content::Source<NavigationController>(
           &preview_contents_->web_contents()->GetController()));
 #endif
 
   registrar_.Add(
       this,
       content::NOTIFICATION_NAV_ENTRY_COMMITTED,
-      content::Source<content::NavigationController>(
+      content::Source<NavigationController>(
           &preview_contents_->web_contents()->GetController()));
 
   gfx::Rect tab_bounds;