Fix ScopedTempDir in base_unittests

base/files/file_proxy_unittest.cc

Index: base/files/file_proxy_unittest.cc
diff --git a/base/files/file_proxy_unittest.cc b/base/files/file_proxy_unittest.cc
index efe5c92429986b8934df58ec9a712060d2fbb6a9..ab3e9ae8fbdb91d127888c50b081a56ac45c1df7 100644
--- a/base/files/file_proxy_unittest.cc
+++ b/base/files/file_proxy_unittest.cc
@@ -83,10 +83,10 @@ class FileProxyTest : public testing::Test {
   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_;