Move scoped_temp_dir from base to base/files

chrome/installer/util/move_tree_work_item.h

Index: chrome/installer/util/move_tree_work_item.h
diff --git a/chrome/installer/util/move_tree_work_item.h b/chrome/installer/util/move_tree_work_item.h
index 62a84bab67b4b97154c1c5d1d3e262c83d9c98d6..cde93021da78a1c07e6ec4601dfe6bcf6b0573c0 100644
--- a/chrome/installer/util/move_tree_work_item.h
+++ b/chrome/installer/util/move_tree_work_item.h
@@ -6,8 +6,8 @@
 #define CHROME_INSTALLER_UTIL_MOVE_TREE_WORK_ITEM_H_
 
 #include "base/file_path.h"
+#include "base/files/scoped_temp_dir.h"
 #include "base/gtest_prod_util.h"
-#include "base/scoped_temp_dir.h"
 #include "chrome/installer/util/work_item.h"
 
 // A WorkItem subclass that recursively move a file system hierarchy from
@@ -57,7 +57,7 @@ class MoveTreeWorkItem : public WorkItem {
   FilePath temp_dir_;
 
   // The temporary directory into which the original dest_path_ has been moved.
-  ScopedTempDir backup_path_;
+  base::ScopedTempDir backup_path_;
 
   // Whether the source was moved to dest_path_
   bool moved_to_dest_path_;