Update from https://crrev.com/315085

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 5acaab6eb63bd25078a7ced3493a415c82f103bd..fc2af1baac570f9506bdda9d18af9f1ee3a89633 100644
--- a/net/base/file_stream_context.cc
+++ b/net/base/file_stream_context.cc
@@ -77,6 +77,12 @@ void FileStream::Context::Orphan() {
 
   orphaned_ = true;
 
+#if defined(OS_WIN)
+  // Clean up weak pointers here to ensure that they are destroyed on the
+  // same thread where they were created.
+  weak_ptr_factory_.InvalidateWeakPtrs();
+#endif
+
   if (!async_in_progress_) {
     CloseAndDelete();
   } else if (file_.IsValid()) {