Detect seek penalties on Linux/ChromeOS.

chrome/browser/metrics/drive_metrics_provider_mac.mm

 // Copyright 2015 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 "chrome/browser/metrics/drive_metrics_provider.h"
 
 // static
 bool DriveMetricsProvider::HasSeekPenalty(const base::FilePath& path,
                                           bool* has_seek_penalty) {
-  *has_seek_penalty = false;
-  return true;
+  // TODO(dbeam): implement.
+  return false;
 }