Regularize ownerships and lifecycle for storage monitor platform classes.

chrome/browser/storage_monitor/storage_monitor_chromeos.h

Index: chrome/browser/storage_monitor/storage_monitor_chromeos.h
diff --git a/chrome/browser/storage_monitor/storage_monitor_chromeos.h b/chrome/browser/storage_monitor/storage_monitor_chromeos.h
index 8596890e3ca26119add2190bd9a3afb050056002..2d8897395efbd1f8ce79d13aec1fb30d546753e1 100644
--- a/chrome/browser/storage_monitor/storage_monitor_chromeos.h
+++ b/chrome/browser/storage_monitor/storage_monitor_chromeos.h
@@ -21,6 +21,10 @@
 #include "chrome/browser/storage_monitor/storage_monitor.h"
 #include "chromeos/disks/disk_mount_manager.h"
 
+namespace chrome {
+class MediaTransferProtocolDeviceObserverLinux;
+}
+
 namespace chromeos {
 
 class StorageMonitorCros
@@ -31,6 +35,10 @@ class StorageMonitorCros
   // Should only be called by browser start up code. Use GetInstance() instead.
   StorageMonitorCros();
 
+  // Sets up disk listeners and issues notifications for any discovered
+  // mount points. Sets up MTP manager and listeners.
+  void Init();
+
   virtual void OnDiskEvent(disks::DiskMountManager::DiskEvent event,
                            const disks::DiskMountManager::Disk* disk) OVERRIDE;
   virtual void OnDeviceEvent(disks::DiskMountManager::DeviceEvent event,
@@ -82,6 +90,9 @@ class StorageMonitorCros
   // Only accessed on the UI thread.
   MountMap mount_map_;
 
+  scoped_ptr<chrome::MediaTransferProtocolDeviceObserverLinux>
+      media_transfer_protocol_device_observer_;
+
   DISALLOW_COPY_AND_ASSIGN(StorageMonitorCros);
 };