StorageMonitor: Make StorageInfo a class.

components/storage_monitor/media_storage_util.h

 // Copyright 2014 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.
 
 // MediaStorageUtil provides information about storage devices attached
 // to the computer.
 
 #ifndef COMPONENTS_STORAGE_MONITOR_MEDIA_STORAGE_UTIL_H_
 #define COMPONENTS_STORAGE_MONITOR_MEDIA_STORAGE_UTIL_H_
 
 #include <set>
 #include <string>
 
 #include "base/basictypes.h"
 #include "base/callback_forward.h"
 #include "base/files/file_path.h"
 
-struct StorageInfo;
+class StorageInfo;
 
 class MediaStorageUtil {
  public:
   typedef std::set<std::string /*device id*/> DeviceIdSet;
 
   // Check if the file system at the passed mount point looks like a media
   // device using the existence of DCIM directory.
   // Returns true if it looks like a media device, otherwise returns false.
   // Mac OS X behaves similarly, but this is not the only heuristic it uses.
   // TODO(vandebo) Try to figure out how Mac OS X decides this, and rename
@@ skipping 28 matching lines @@
 
   // Returns true if the |id| is both a removable device and also
   // currently attached.
   static bool IsRemovableStorageAttached(const std::string& id);
 
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(MediaStorageUtil);
 };
 
 #endif  // COMPONENTS_STORAGE_MONITOR_MEDIA_STORAGE_UTIL_H_