Delete unused class AsyncFile.

webrtc/base/asyncfile.cc

Index: webrtc/base/asyncfile.cc
diff --git a/webrtc/base/asyncfile.cc b/webrtc/base/asyncfile.cc
deleted file mode 100644
index ea904c554ea25a816b710e76035a1e3ec3da9257..0000000000000000000000000000000000000000
--- a/webrtc/base/asyncfile.cc
+++ /dev/null
@@ -1,21 +0,0 @@
-/*
- *  Copyright 2010 The WebRTC Project Authors. All rights reserved.
- *
- *  Use of this source code is governed by a BSD-style license
- *  that can be found in the LICENSE file in the root of the source
- *  tree. An additional intellectual property rights grant can be found
- *  in the file PATENTS.  All contributing project authors may
- *  be found in the AUTHORS file in the root of the source tree.
- */
-
-#include "webrtc/base/asyncfile.h"
-
-namespace rtc {
-
-AsyncFile::AsyncFile() {
-}
-
-AsyncFile::~AsyncFile() {
-}
-
-}  // namespace rtc