Remove MTP support on Linux.

chrome/browser/media_galleries/linux/mtp_device_task_helper_map_service.cc

-// Copyright 2013 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/media_galleries/linux/mtp_device_task_helper_map_service.h"
-
-#include "base/logging.h"
-#include "base/stl_util.h"
-#include "chrome/browser/media_galleries/linux/mtp_device_task_helper.h"
-#include "content/public/browser/browser_thread.h"
-
-namespace {
-
-base::LazyInstance<MTPDeviceTaskHelperMapService>
-    g_mtp_device_task_helper_map_service = LAZY_INSTANCE_INITIALIZER;
-
-}  // namespace
-
-// static
-MTPDeviceTaskHelperMapService* MTPDeviceTaskHelperMapService::GetInstance() {
-  return g_mtp_device_task_helper_map_service.Pointer();
-}
-
-MTPDeviceTaskHelper* MTPDeviceTaskHelperMapService::CreateDeviceTaskHelper(
-    const std::string& storage_name,
-    const bool read_only) {
-  DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
-  DCHECK(!storage_name.empty());
-  const MTPDeviceTaskHelperKey key =
-      GetMTPDeviceTaskHelperKey(storage_name, read_only);
-  DCHECK(!base::ContainsKey(task_helper_map_, key));
-  MTPDeviceTaskHelper* task_helper = new MTPDeviceTaskHelper();
-  task_helper_map_[key] = task_helper;
-  return task_helper;
-}
-
-void MTPDeviceTaskHelperMapService::DestroyDeviceTaskHelper(
-    const std::string& storage_name,
-    const bool read_only) {
-  DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
-  const MTPDeviceTaskHelperKey key =
-      GetMTPDeviceTaskHelperKey(storage_name, read_only);
-  TaskHelperMap::iterator it = task_helper_map_.find(key);
-  if (it == task_helper_map_.end())
-    return;
-  delete it->second;
-  task_helper_map_.erase(it);
-}
-
-MTPDeviceTaskHelper* MTPDeviceTaskHelperMapService::GetDeviceTaskHelper(
-    const std::string& storage_name,
-    const bool read_only) {
-  DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
-  DCHECK(!storage_name.empty());
-  const MTPDeviceTaskHelperKey key =
-      GetMTPDeviceTaskHelperKey(storage_name, read_only);
-  TaskHelperMap::const_iterator it = task_helper_map_.find(key);
-  return (it != task_helper_map_.end()) ? it->second : NULL;
-}
-
-// static
-MTPDeviceTaskHelperMapService::MTPDeviceTaskHelperKey
-MTPDeviceTaskHelperMapService::GetMTPDeviceTaskHelperKey(
-    const std::string& storage_name,
-    const bool read_only) {
-  return (read_only ? "ReadOnly" : "ReadWrite") + std::string("|") +
-         storage_name;
-}
-
-MTPDeviceTaskHelperMapService::MTPDeviceTaskHelperMapService() {
-}
-
-MTPDeviceTaskHelperMapService::~MTPDeviceTaskHelperMapService() {
-}