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

BUG=98716
TBR=joi
Review URL: http://codereview.chromium.org/8983012

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@116328 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/chrome/browser/errorpage_browsertest.cc b/chrome/browser/errorpage_browsertest.cc
index 4351fce20f..431762f1 100644
--- a/chrome/browser/errorpage_browsertest.cc
+++ b/chrome/browser/errorpage_browsertest.cc
@@ -15,6 +15,7 @@
 #include "content/test/test_navigation_observer.h"
 
 using content::BrowserThread;
+using content::NavigationController;
 
 class ErrorPageTest : public InProcessBrowserTest {
  public:
@@ -81,7 +82,7 @@
         ASCIIToUTF16(expected_title));
 
     TestNavigationObserver test_navigation_observer(
-      content::Source<content::NavigationController>(
+      content::Source<NavigationController>(
             &browser()->GetSelectedTabContentsWrapper()->tab_contents()->
                 GetController()),
         NULL,