Chrome Version: 57.0.2970.0 
OS: ChromeOS

What steps will reproduce the problem?
(1) Create a zip file and e.g. save it in Downloads.
(2) Open the zip file.

What is the expected result?

Expect that opening the zipfile causes the ZIP unpacker extension process to start up.

What happens instead?

Opening the zip file causes at least the following processes to be created:
1. ZIP unpacker.
2. Video Player.
3. Audio Player.
4. Gallery.

Processes 2-4 start and then stop again ~10s later, but in the meantime they each consume ~42MB of RAM.
The ZIP unpacker process never appears to stop running.

Although ~125MB of RAM is only consumed for ~10s, that is a significant overhead on a low-memory device; certainly significant enough to trigger a tab OOM.