Move MTPDeviceDelegateImplLinux worker classes to its own files.

chrome/browser/media_gallery/linux/mtp_device_object_enumerator.cc

+// Copyright (c) 2012 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_gallery/linux/mtp_device_object_enumerator.h"
+
+namespace chrome {
+
+MTPDeviceObjectEnumerator::MTPDeviceObjectEnumerator(
+    const MtpFileEntries& entries)
+    : file_entries_(entries),
+      file_entry_iter_(file_entries_.begin()) {
+}
+
+MTPDeviceObjectEnumerator::~MTPDeviceObjectEnumerator() {
+}
+
+FilePath MTPDeviceObjectEnumerator::Next() {
+  if (file_entry_iter_ == file_entries_.end())
+    return FilePath();
+
+  current_file_info_ = *file_entry_iter_;
+  ++file_entry_iter_;
+  return FilePath(current_file_info_.file_name());
+}
+
+int64 MTPDeviceObjectEnumerator::Size() {
+  return current_file_info_.file_size();
+}
+
+bool MTPDeviceObjectEnumerator::IsDirectory() {
+  return current_file_info_.file_type() == MtpFileEntry::FILE_TYPE_FOLDER;
+}
+
+base::Time MTPDeviceObjectEnumerator::LastModifiedTime() {
+  return base::Time::FromTimeT(current_file_info_.modification_time());
+}
+
+}  // namespace chrome