How do I make Google Chrome save PDF files without opening a second window?

Solution 1:

To save the file without fetching from remote server again, do Print-> Save as PDF.

Solution 2:

I think op needs this answer:

This behavior can be switched off, only the setting is a bit hidden:

  1. Go to chrome://settings/content
  2. Scroll down to "PDF Documents"
  3. Uncheck "Open PDF files in the default PDF viewer application"

Taken from: https://superuser.com/a/1177756