Copy a version of download action for ChromeOS am: 97cb0585a1 am: fe74c61b11

Original change: https://android-review.googlesource.com/c/platform/system/update_engine/+/1513379

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: Iec71031818205ccec4a806dd2ff799b9b9554d3b