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

chrome/browser/extensions/isolated_app_browsertest.cc

Index: chrome/browser/extensions/isolated_app_browsertest.cc
===================================================================
--- chrome/browser/extensions/isolated_app_browsertest.cc	(revision 116288)
+++ chrome/browser/extensions/isolated_app_browsertest.cc	(working copy)
@@ -18,6 +18,8 @@
 #include "content/public/browser/render_process_host.h"
 #include "net/base/mock_host_resolver.h"
 
+using content::NavigationController;
+
 namespace {
 
 class IsolatedAppTest : public ExtensionBrowserTest {
@@ -118,7 +120,7 @@
   ui_test_utils::CrashTab(tab1);
   ui_test_utils::WindowedNotificationObserver observer(
       content::NOTIFICATION_LOAD_STOP,
-      content::Source<content::NavigationController>(
+      content::Source<NavigationController>(
           &browser()->GetSelectedTabContentsWrapper()->tab_contents()->
               GetController()));
   browser()->Reload(CURRENT_TAB);