Regularize ownerships and lifecycle for storage monitor platform classes.

chrome/browser/storage_monitor/storage_monitor_linux.h

 // 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.
 
 // StorageMonitorLinux listens for mount point changes, notifies listeners
 // about the addition and deletion of media devices, and answers queries about
 // mounted devices.
 
 #ifndef CHROME_BROWSER_STORAGE_MONITOR_STORAGE_MONITOR_LINUX_H_
 #define CHROME_BROWSER_STORAGE_MONITOR_STORAGE_MONITOR_LINUX_H_
@@ skipping 25 matching lines @@
                                   std::string* device_id,
                                   string16* name,
                                   bool* removable,
                                   uint64* partition_size_in_bytes,
                                   string16* volume_label,
                                   string16* vendor_name,
                                   string16* model_name);
 
 namespace chrome {
 
+class MediaTransferProtocolDeviceObserverLinux;
+
 class StorageMonitorLinux
     : public StorageMonitor,
       public base::RefCountedThreadSafe<StorageMonitorLinux,
           content::BrowserThread::DeleteOnFileThread> {
  public:
   // Should only be called by browser start up code.  Use GetInstance() instead.
   explicit StorageMonitorLinux(const base::FilePath& path);
 
   // Must be called for StorageMonitorLinux to work.
   void Init();
@@ skipping 78 matching lines @@
   // Keep in mind on Linux, a device can be mounted at multiple mount points,
   // and multiple devices can be mounted at a mount point.
   MountMap mount_info_map_;
 
   // Because a device can be mounted to multiple places, we only want to
   // notify about one of them. If (and only if) that one is unmounted, we need
   // to notify about it's departure and notify about another one of it's mount
   // points.
   MountPriorityMap mount_priority_map_;
 
+  scoped_ptr<MediaTransferProtocolDeviceObserverLinux>
+      media_transfer_protocol_device_observer_;
+
   DISALLOW_COPY_AND_ASSIGN(StorageMonitorLinux);
 };
 
 }  // namespace chrome
 
 #endif  // CHROME_BROWSER_STORAGE_MONITOR_STORAGE_MONITOR_LINUX_H_