Deflake Simple Cache backend on Windows.

net/disk_cache/simple/simple_util_posix.cc

+// Copyright 2014 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/disk_cache/simple/simple_util.h"
+
+#include "base/files/file_util.h"
+
+namespace disk_cache {
+namespace simple_util {
+
+bool SimpleCacheDeleteFile(const base::FilePath& path) {
+  return base::DeleteFile(path, false);
+}
+
+}  // namespace simple_util
+}  // namespace disk_cache