Move scoped_temp_dir from base to base/files

chrome/browser/ui/webui/downloads_dom_handler_browsertest.cc

Index: chrome/browser/ui/webui/downloads_dom_handler_browsertest.cc
diff --git a/chrome/browser/ui/webui/downloads_dom_handler_browsertest.cc b/chrome/browser/ui/webui/downloads_dom_handler_browsertest.cc
index 7f43a0731a9ee65cb9d62a3c4ba0db99ce1e5c8c..e2f3daa60a7d1be06ce004db47c5babf818e5749 100644
--- a/chrome/browser/ui/webui/downloads_dom_handler_browsertest.cc
+++ b/chrome/browser/ui/webui/downloads_dom_handler_browsertest.cc
@@ -3,8 +3,8 @@
 // found in the LICENSE file.
 
 #include "base/auto_reset.h"
+#include "base/files/scoped_temp_dir.h"
 #include "base/json/json_reader.h"
-#include "base/scoped_temp_dir.h"
 #include "base/values.h"
 #include "chrome/browser/prefs/pref_service.h"
 #include "chrome/browser/profiles/profile.h"
@@ -127,7 +127,7 @@ class DownloadsDOMHandlerTest : public InProcessBrowserTest {
   }
 
  private:
-  ScopedTempDir downloads_directory_;
+  base::ScopedTempDir downloads_directory_;
 
   DISALLOW_COPY_AND_ASSIGN(DownloadsDOMHandlerTest);
 };