Currently there are images in the cr_elements/ directory that are included in the .grdp config (see: https://codereview.chromium.org/2848973003/patch/780001/790053) which are unnecessary.

They are redundant because the CSS file using them *should* already be doing "flattenhtml". However, there's an issue with the CSS pulled from cr_elements into Settings build such that:
1) Vulcanize string replaces the relative path pointing to the asset
2) grit will no longer flatten that path because it's not relative anymore.

Once we figure out a way to flatten cr_elements resources correctly, we should remove these assets from the .grd files.