make media gallery directory tooltips in media gallery config dialog absolute paths

chrome/browser/media_gallery/media_file_system_registry.cc

Index: chrome/browser/media_gallery/media_file_system_registry.cc
diff --git a/chrome/browser/media_gallery/media_file_system_registry.cc b/chrome/browser/media_gallery/media_file_system_registry.cc
index 9a39533db94c0b574afc37a1d809226924d10562..b1164526e983f024b957a4cc5144f1fa9d001f07 100644
--- a/chrome/browser/media_gallery/media_file_system_registry.cc
+++ b/chrome/browser/media_gallery/media_file_system_registry.cc
@@ -111,13 +111,11 @@ class ExtensionGalleriesHost
       const std::string& device_id = gallery_info.device_id;
       // TODO(kmadhusu) handle MTP devices.
       DCHECK(MediaStorageUtil::IsMassStorageDevice(device_id));
-      FilePath path = MediaStorageUtil::FindDevicePathById(device_id);
+      FilePath path = gallery_info.AbsolutePath();
       // TODO(vandebo) we also need to check that these galleries are attached.
       // For now, just skip over entries that we couldn't find.
-      if (path.empty())
+      if (!path.IsAbsolute())
         continue;
-      CHECK(!path.empty());
-      path = path.Append(gallery_info.path);
 
       MediaFileSystemRegistry::MediaFSInfo new_entry;
       new_entry.name = gallery_info.display_name;