Fix ScopedTempDir in base_unittests

BUG=546640

Review URL: https://codereview.chromium.org/1415293006

Cr-Commit-Position: refs/heads/master@{#355691}


CrOS-Libchrome-Original-Commit: 8fc5ec7879e78806a00e6755e4bd8ab0ffd07df2
diff --git a/base/files/file_proxy_unittest.cc b/base/files/file_proxy_unittest.cc
index efe5c92..ab3e9ae 100644
--- a/base/files/file_proxy_unittest.cc
+++ b/base/files/file_proxy_unittest.cc
@@ -83,10 +83,10 @@
   const FilePath& test_dir_path() const { return dir_.path(); }
   const FilePath test_path() const { return dir_.path().AppendASCII("test"); }
 
+  ScopedTempDir dir_;
   MessageLoopForIO message_loop_;
   Thread file_thread_;
 
-  ScopedTempDir dir_;
   File::Error error_;
   FilePath path_;
   File::Info file_info_;