Fix a use after free crasher in the ReadAsync task initiated on Windows by the FileStream::Context:…

net/base/file_stream_context.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "net/base/file_stream_context.h"
 
 #include "base/files/file_path.h"
 #include "base/location.h"
 #include "base/message_loop/message_loop_proxy.h"
 #include "base/profiler/scoped_tracker.h"
@@ skipping 59 matching lines @@
   return *this;
 }
 
 // ---------------------------------------------------------------------
 
 void FileStream::Context::Orphan() {
   DCHECK(!orphaned_);
 
   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()) {
 #if defined(OS_WIN)
     CancelIo(file_.GetPlatformFile());
 #endif
   }
 }
 
 void FileStream::Context::Open(const base::FilePath& path,
@@ skipping 150 matching lines @@
   // should be reset before Close() because it shouldn't run if any async
   // operation is in progress.
   async_in_progress_ = false;
   if (orphaned_)
     CloseAndDelete();
   else
     callback.Run(result.result);
 }
 
 }  // namespace net