A bit of detective work and we find the following.
Google Chignin menhir and we get "10 May 2014 — Dernièrement lors du défrichage de parcelles au lieu-dit Les Cailles sur la commune de Chignin et en vue d'une mise en œuvre de plantation ..."
Opening the link gives a nice picture, but no words come up with the page (not on my laptop anyway.
Looking on the ign geoportail link at the top of the page (2nd right blue aeroplane icon), and with ign classic map selection we can find that the locality (lieu-dit) Les Cailles is south of Chignin central, just west of Tormery.
Now to use Google streetview, and unfortunately no coverage of the exact area to "drive round" and find the stone. But we can use it as best as possible to find a view which sort of matches the hilltops on the horizon while looking north (look at the shadows) with the picture on the sitepage.
Also looking at the picture from the Le Dauphine article, we see that there is a bit of a hillside to the right of the stone. This can be seen in the aerial views at Les Cailles.
Open Zoom Earth (4th from right blue aeroplane icon), and move it so the cross hatch matches the selected place and we get a possible latitude and longitude as 45.5168, 6.0124.
Unfortunately, nothing shows on the aerial views, but I am pretty sure its about there!
A good way to spend half an hour on a cold foggy morning. Now if only I could somehow zap myself out there to check!
Something is not right. This message is just to keep things from messing up down the road