Un-duplicate EvictFileFromSystemCache....

base/test_file_util_linux.cc

+// Copyright (c) 2008 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 "base/test_file_util.h"
+
+#include <fcntl.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+
+#include "base/file_path.h"
+
+namespace file_util {
+
+bool EvictFileFromSystemCache(const wchar_t* file) {
+  FilePath fpath = FilePath::FromWStringHack(file);
+  int fd = open(fpath.value().c_str(), O_RDONLY);
+  if (fd < 0)
+    return false;
+  if (fdatasync(fd) != 0)
+    return false;
+  if (posix_fadvise(fd, 0, 0, POSIX_FADV_DONTNEED) != 0)
+    return false;
+  close(fd);
+  return true;
+}
+
+}  // namespace file_util