How to disable Google Drive's own "delete?" dialogue?
have a look at this entry.
it worked for me.
http://productforums.google.com/forum/#!topic/drive/dP44DklCxoc
Specifically this answer: http://productforums.google.com/d/msg/drive/dP44DklCxoc/7c1x_hfqdnsJ
Here's a copy of the answer:
Frank_P (Google employee):
Hi folks, We'll work on adding a way to disable this dialog for good. In the meantime, it can be disabled with a command line option. You'll have to start Drive manually for this to work.
On Windows: Start -> type "cmd.exe" and hit Enter In the command window, enter this exactly:
"C:\Program Files (x86)\Google\Drive\googledrivesync.exe" --noshow_confirmation_dialog_on_delete
On Mac: Run the Terminal app (in /Applications/Utilitites) In the terminal window, enter this exactly:
/Applications/Google\ Drive.app/Contents/MacOS/Google\ Drive --noshow_confirmation_dialog_on_delete