Fix WeakPtrFactory member order in net/url_request/

net/url_request/url_fetcher_response_writer.cc

Index: net/url_request/url_fetcher_response_writer.cc
diff --git a/net/url_request/url_fetcher_response_writer.cc b/net/url_request/url_fetcher_response_writer.cc
index 76c73df0f94763d61206759d12f5dd13fa9d6323..f14ccc027d940785ff059eaef83c65736bb9aaea 100644
--- a/net/url_request/url_fetcher_response_writer.cc
+++ b/net/url_request/url_fetcher_response_writer.cc
@@ -52,10 +52,10 @@ URLFetcherStringWriter* URLFetcherStringWriter::AsStringWriter() {
 URLFetcherFileWriter::URLFetcherFileWriter(
     scoped_refptr<base::SequencedTaskRunner> file_task_runner,
     const base::FilePath& file_path)
-    : weak_factory_(this),
-      file_task_runner_(file_task_runner),
+    : file_task_runner_(file_task_runner),
       file_path_(file_path),
-      owns_file_(false) {
+      owns_file_(false),
+      weak_factory_(this) {
   DCHECK(file_task_runner_.get());
 }