Use a direct include of strings headers in chrome/browser/extensions/, part 3.

BUG=247723
TEST=none
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Review URL: https://chromiumcodereview.appspot.com/16402006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@205295 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/chrome/browser/extensions/extension_service_unittest.cc b/chrome/browser/extensions/extension_service_unittest.cc
index 7d32219d..add357a 100644
--- a/chrome/browser/extensions/extension_service_unittest.cc
+++ b/chrome/browser/extensions/extension_service_unittest.cc
@@ -23,9 +23,9 @@
 #include "base/message_loop.h"
 #include "base/path_service.h"
 #include "base/stl_util.h"
-#include "base/string16.h"
-#include "base/string_util.h"
+#include "base/strings/string16.h"
 #include "base/strings/string_number_conversions.h"
+#include "base/strings/string_util.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/version.h"
 #include "chrome/browser/browser_process.h"