Revert of Some linked_ptr removal in chromeos file_browser_handler.

chrome/browser/chromeos/file_manager/volume_manager.h

 // 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.
 
 #ifndef CHROME_BROWSER_CHROMEOS_FILE_MANAGER_VOLUME_MANAGER_H_
 #define CHROME_BROWSER_CHROMEOS_FILE_MANAGER_VOLUME_MANAGER_H_
 
 #include <map>
 #include <memory>
 #include <string>
 #include <vector>
 
 #include "base/callback.h"
 #include "base/files/file.h"
 #include "base/files/file_path.h"
 #include "base/macros.h"
+#include "base/memory/linked_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "base/observer_list.h"
 #include "chrome/browser/chromeos/arc/arc_session_manager.h"
 #include "chrome/browser/chromeos/drive/drive_integration_service.h"
 #include "chrome/browser/chromeos/file_system_provider/observer.h"
 #include "chrome/browser/chromeos/file_system_provider/service.h"
 #include "chromeos/dbus/cros_disks_client.h"
 #include "chromeos/disks/disk_mount_manager.h"
 #include "components/keyed_service/core/keyed_service.h"
 #include "components/prefs/pref_change_registrar.h"
@@ skipping 45 matching lines @@
 enum Source { SOURCE_FILE, SOURCE_DEVICE, SOURCE_NETWORK, SOURCE_SYSTEM };
 
 // Represents a volume (mount point) in the volume manager. Validity of the data
 // is guaranteed by the weak pointer. Simply saying, the weak pointer should be
 // valid as long as the volume is mounted.
 class Volume : public base::SupportsWeakPtr<Volume> {
  public:
   ~Volume();
 
   // Factory static methods for different volume types.
-  static std::unique_ptr<Volume> CreateForDrive(Profile* profile);
-  static std::unique_ptr<Volume> CreateForDownloads(
-      const base::FilePath& downloads_path);
-  static std::unique_ptr<Volume> CreateForRemovable(
+  static Volume* CreateForDrive(Profile* profile);
+  static Volume* CreateForDownloads(const base::FilePath& downloads_path);
+  static Volume* CreateForRemovable(
       const chromeos::disks::DiskMountManager::MountPointInfo& mount_point,
       const chromeos::disks::DiskMountManager::Disk* disk);
-  static std::unique_ptr<Volume> CreateForProvidedFileSystem(
+  static Volume* CreateForProvidedFileSystem(
       const chromeos::file_system_provider::ProvidedFileSystemInfo&
           file_system_info,
       MountContext mount_context);
-  static std::unique_ptr<Volume> CreateForMTP(const base::FilePath& mount_path,
-                                              const std::string& label,
-                                              bool read_only);
-  static std::unique_ptr<Volume> CreateForMediaView(
-      const std::string& root_document_id);
-  static std::unique_ptr<Volume> CreateForTesting(
-      const base::FilePath& path,
-      VolumeType volume_type,
-      chromeos::DeviceType device_type,
-      bool read_only);
-  static std::unique_ptr<Volume> CreateForTesting(
-      const base::FilePath& device_path,
-      const base::FilePath& mount_path);
+  static Volume* CreateForMTP(const base::FilePath& mount_path,
+                              const std::string& label,
+                              bool read_only);
+  static Volume* CreateForMediaView(const std::string& root_document_id);
+  static Volume* CreateForTesting(const base::FilePath& path,
+                                  VolumeType volume_type,
+                                  chromeos::DeviceType device_type,
+                                  bool read_only);
+  static Volume* CreateForTesting(const base::FilePath& device_path,
+                                  const base::FilePath& mount_path);
 
   // Getters for all members. See below for details.
   const std::string& volume_id() const { return volume_id_; }
   const std::string& file_system_id() const { return file_system_id_; }
   const std::string& extension_id() const { return extension_id_; }
   Source source() const { return source_; }
   VolumeType type() const { return type_; }
   chromeos::DeviceType device_type() const { return device_type_; }
   const base::FilePath& source_path() const { return source_path_; }
   const base::FilePath& mount_path() const { return mount_path_; }
@@ skipping 151 matching lines @@
   bool RegisterDownloadsDirectoryForTesting(const base::FilePath& path);
 
   // For testing purpose, adds a volume info pointing to |path|, with TESTING
   // type. Assumes that the mount point is already registered.
   void AddVolumeForTesting(const base::FilePath& path,
                            VolumeType volume_type,
                            chromeos::DeviceType device_type,
                            bool read_only);
 
   // For testing purpose, adds the volume info to the volume manager.
-  void AddVolumeForTesting(std::unique_ptr<Volume> volume);
+  void AddVolumeForTesting(const linked_ptr<Volume>& volume);
 
   // drive::DriveIntegrationServiceObserver overrides.
   void OnFileSystemMounted() override;
   void OnFileSystemBeingUnmounted() override;
 
   // chromeos::disks::DiskMountManager::Observer overrides.
   void OnDiskEvent(
       chromeos::disks::DiskMountManager::DiskEvent event,
       const chromeos::disks::DiskMountManager::Disk* disk) override;
   void OnDeviceEvent(chromeos::disks::DiskMountManager::DeviceEvent event,
@@ skipping 31 matching lines @@
       const storage_monitor::StorageInfo& info) override;
   void OnRemovableStorageDetached(
       const storage_monitor::StorageInfo& info) override;
 
   SnapshotManager* snapshot_manager() { return snapshot_manager_.get(); }
 
  private:
   void OnDiskMountManagerRefreshed(bool success);
   void OnStorageMonitorInitialized();
   void DoMountEvent(chromeos::MountError error_code,
-                    std::unique_ptr<Volume> volume);
-  void DoUnmountEvent(chromeos::MountError error_code, const Volume& volume);
+                    const linked_ptr<Volume>& volume);
+  void DoUnmountEvent(chromeos::MountError error_code,
+                      const linked_ptr<Volume>& volume);
   void OnExternalStorageDisabledChangedUnmountCallback(
       chromeos::MountError error_code);
 
   Profile* profile_;
   drive::DriveIntegrationService* drive_integration_service_;  // Not owned.
   chromeos::disks::DiskMountManager* disk_mount_manager_;      // Not owned.
   PrefChangeRegistrar pref_change_registrar_;
   base::ObserverList<VolumeManagerObserver> observers_;
   chromeos::file_system_provider::Service*
       file_system_provider_service_;  // Not owned by this class.
   GetMtpStorageInfoCallback get_mtp_storage_info_callback_;
-  std::map<std::string, std::unique_ptr<Volume>> mounted_volumes_;
+  std::map<std::string, linked_ptr<Volume>> mounted_volumes_;
   std::unique_ptr<SnapshotManager> snapshot_manager_;
   bool arc_volumes_mounted_ = false;
 
   // Note: This should remain the last member so it'll be destroyed and
   // invalidate its weak pointers before any other members are destroyed.
   base::WeakPtrFactory<VolumeManager> weak_ptr_factory_;
   DISALLOW_COPY_AND_ASSIGN(VolumeManager);
 };
 
 }  // namespace file_manager
 
 #endif  // CHROME_BROWSER_CHROMEOS_FILE_MANAGER_VOLUME_MANAGER_H_