No they aren't, and unless you have proof that they do it's a conspiracy theory on the level of aliens and the Rothschild Illuminati.
There is no reason to think this isn't still going on.
But it is also true that Google and ATT are very different companies. The Snowden leaks lead Google to encrypt internal links, once they realized NSA were tapping them; ATT built NSA Room 641A.
But this is rather more complicated than that; I'd bet money there are are people employed at Google who wear more than one hat[1], as there have been at tech companies throughout the history of Silicon Valley. And practices at Google makes NSA's life easier - Organizing the World's Advertising Targets is actually a remarkably compatible goal.