Move scoped_temp_dir from base to base/files

chrome/browser/history/thumbnail_database_unittest.cc

Index: chrome/browser/history/thumbnail_database_unittest.cc
diff --git a/chrome/browser/history/thumbnail_database_unittest.cc b/chrome/browser/history/thumbnail_database_unittest.cc
index 1123e997ae6a59a9e5af7780d4cdef5f46826f98..2ba29dfd632c70faf7200e6cf59bc4aaef7382d8 100644
--- a/chrome/browser/history/thumbnail_database_unittest.cc
+++ b/chrome/browser/history/thumbnail_database_unittest.cc
@@ -9,9 +9,9 @@
 #include "base/command_line.h"
 #include "base/file_path.h"
 #include "base/file_util.h"
+#include "base/files/scoped_temp_dir.h"
 #include "base/memory/ref_counted_memory.h"
 #include "base/path_service.h"
-#include "base/scoped_temp_dir.h"
 #include "chrome/browser/history/history_database.h"
 #include "chrome/browser/history/history_unittest_base.h"
 #include "chrome/browser/history/thumbnail_database.h"
@@ -79,7 +79,7 @@ class ThumbnailDatabaseTest : public testing::Test {
 
   scoped_ptr<SkBitmap> google_bitmap_;
 
-  ScopedTempDir temp_dir_;
+  base::ScopedTempDir temp_dir_;
   FilePath file_name_;
   FilePath new_file_name_;
   FilePath history_db_name_;