StorageMonitor: Make StorageInfo a class.

Review URL: https://codereview.chromium.org/168293002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@251957 0039d316-1c4b-4281-b951-d872f2087c98

components/storage_monitor/media_storage_util.h

@@ -15,7 +15,7 @@
 #include "base/callback_forward.h"
 #include "base/files/file_path.h"
 
-struct StorageInfo;
+class StorageInfo;
 
 class MediaStorageUtil {
  public:

components/storage_monitor/storage_info.h

@@ -8,7 +8,7 @@
 #include "base/files/file_path.h"
 #include "base/strings/string16.h"
 
-struct StorageInfo {
+class StorageInfo {
  public:
   enum Type {
     // A removable mass storage device with a DCIM directory.