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

chrome/browser/debugger/devtools_sanity_unittest.cc

Index: chrome/browser/debugger/devtools_sanity_unittest.cc
===================================================================
--- chrome/browser/debugger/devtools_sanity_unittest.cc	(revision 116288)
+++ chrome/browser/debugger/devtools_sanity_unittest.cc	(working copy)
@@ -40,6 +40,7 @@
 using content::DevToolsManager;
 using content::DevToolsAgentHost;
 using content::DevToolsAgentHostRegistry;
+using content::NavigationController;
 using content::WorkerService;
 using content::WorkerServiceObserver;
 
@@ -412,7 +413,7 @@
     if (client_contents->IsLoading()) {
       ui_test_utils::WindowedNotificationObserver observer(
           content::NOTIFICATION_LOAD_STOP,
-          content::Source<content::NavigationController>(
+          content::Source<NavigationController>(
               &client_contents->GetController()));
       observer.Wait();
     }
@@ -525,7 +526,7 @@
   ui_test_utils::CrashTab(GetInspectedTab());
   ui_test_utils::WindowedNotificationObserver observer(
       content::NOTIFICATION_LOAD_STOP,
-      content::Source<content::NavigationController>(
+      content::Source<NavigationController>(
           &browser()->GetSelectedTabContentsWrapper()->web_contents()->
               GetController()));
   browser()->Reload(CURRENT_TAB);