The chromeusp.zip file you have requested: Skins / Half-Life 2 Chrome USP Skin - 605.58kb is not available. Perhaps try browsing all files for the game Half-Life 2 and upload any files you want to share or are missing. This is the only information we could locate:
Metallic, reflective skin for the USP. Includes view and world skins. The screenshot doesn't show the effect. You need to see it in the game. It has new textures and custom normal maps.