Use a direct include of strings headers in chrome/browser/extensions/, part 4.

BUG=247723
TEST=none
[email protected]

Review URL: https://chromiumcodereview.appspot.com/16744004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@205253 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/chrome/browser/extensions/menu_manager.h b/chrome/browser/extensions/menu_manager.h
index bbbe0f0..c4e56ac 100644
--- a/chrome/browser/extensions/menu_manager.h
+++ b/chrome/browser/extensions/menu_manager.h
@@ -15,7 +15,7 @@
 #include "base/gtest_prod_util.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
-#include "base/string16.h"
+#include "base/strings/string16.h"
 #include "base/values.h"
 #include "chrome/browser/extensions/extension_icon_manager.h"
 #include "content/public/browser/notification_observer.h"