net: Make sure the FileStream file is closed on the worker thread.

net/base/file_stream_context.cc

Index: net/base/file_stream_context.cc
diff --git a/net/base/file_stream_context.cc b/net/base/file_stream_context.cc
index 13467ec7c6274ab337c687a16983b0bbced28b97..487144e77bad3509a939d6c0178a74874fdc2b0e 100644
--- a/net/base/file_stream_context.cc
+++ b/net/base/file_stream_context.cc
@@ -182,10 +182,10 @@ FileStream::Context::IOResult FileStream::Context::CloseFileImpl() {
 
 void FileStream::Context::OnOpenCompleted(const CompletionCallback& callback,
                                           OpenResult open_result) {
-  if (open_result.file.IsValid() && !orphaned_) {
-    file_ = open_result.file.Pass();
+  file_ = open_result.file.Pass();
+  if (file_.IsValid() && !orphaned_)
     OnAsyncFileOpened();
-  }
+
   OnAsyncCompleted(IntToInt64(callback), open_result.error_code);
 }